Most historians agree that the "Jack The Ripper" murders happened between August and November, 1888.
However, it is impossible to ascertain which murders in Whitechapel during 1888 and 1889 are actually attributable to "Jack the Ripper" and there is conjecture that the Ripper may have killed previously and/or gone on to murder women later (most theories suggest this was in Boston or elsewhere in the northeastern USA).
The earliest murder usually associated with Jack the Ripper is that of Emma Smith on April 2, 1888. However, it is now generally considered that the facts of this case do not match with the characteristics of the definite Jack the Ripper cases. There were several non-fatal attacks on women early in 1888 which may potentially fit with the Ripper's modus operandii.
The earliest likely Ripper murder is that of Martha Tabram, on the night of 6-7 August 1888. While Tabram is not a "canonical" Ripper victim, the facts of her murder are consistent with a killer who would go on to commit the Ripper murder-mutilations.
The canonical (or widely accepted) Ripper victims are:
1. Mary Ann (or "Polly") Nicholls, 31 August 1888.
2. Annie Chapman, 8 September 1888.
3. Elizabeth Stride, 30 September 1888.
4. Catherine Eddowes, 30 September 1888.
5. Mary Jane Kelly, 9 November 1888.
The following three murders have also been attributed by some sources to the Ripper:
1. Rose Mylett, 20 December 1888.
2. Alice McKenzie, 17 July 1889.
3. Frances Coles, 13 February 1891.
However, there are various features of each case which make any connection with the Ripper cases dubious.
In addition, there were two mutilated female torsos discovered in the vicinity, one on 2 October 1888 in Whitehall and one on 10 September 1889 in Whitechapel. Some commentators link these to Jack the Ripper.
Nobody knows for sure. If you believe that his only victims were the five most commonly given (Nichols, Chapman, Stride, Eddows, Kelly) then his spree lasted from August 1888 to November 1888.
Most experts now believe that the Ripper killed many more than originally thought, extending his timeline into the 1890s and some believe into the early 20th century.
There is much controversy which victims to include or leave out as crimes by the original Jack The Ripper.
I guess it depends on who you ask. If you believe that the first victim was Maryann (Polly) Nickols and the last was Mary Jane Kelly then the time frame is about 4 months. Scotland Yard thought otherwise.
There were 2 and possibly 3 murders of prostitutes earlier in the year of 1888 that bear striking similarities to the other Ripper murders. And Scotland Yard was also aware of similar murders that were years after Mary Kelly.
What we do know is that killers like this do not stop. They can move on, die, get incarcerated, or just get too old. So to answer the question, nobody can say for sure but the London police measured the time in years.
I wish there was a hard and fast answer to this question but there has been so much debate about which victims belonged to the killer we know as Jack The Ripper. There are different opinions on when he started and if he really disappeared.
Most experts now believe that Mary Ann Nichols was not the first victim and Mary Kelly was not the last. We may never know for sure how many victims were killed by the Ripper.
The last of the canonical five murders was Mary Kelly on November 9th, 1888. But some people believe that later murders in Whitechaple were also the work of Jack the Ripper. And others believe that Jack the Ripper left the country and committed murders in the US. We don't know for sure. Soon after Kelly's death, the body of Montagu Druitt was found in the Thames, and a note went round Scotland Yard saying that there would be no more murders now. Assuming Kelly was the last Ripper victim, this would point to Druitt as the serial murderer. As for some other murders in the area in the following year or two, many authors have tried to link these to the Ripper, but most experts are not convinced.
Jack the Ripper's reasons for discontinuing his murders are unknown. Many theories have been put forth, such as that he committed suicide, that he fled the country, or that he was arrested and/ or institutionalized for other offenses. This last theory is quite probably the most likely.
As 'Jack' was never identified this fact is not known. There would be very few choices as to what became of the Ripper after his last victim. He could be dead. He could have moved or he killed until he started to get old and maybe a little infirm. He was most likely arrested for some other offense and jailed, without the police realizing whom they had.
The experts at the time judged that the mode of operation indicated that the same man had committed all the murders. The wounds were similer. The method was similer. The type of victim was similer.
It could have been anyone but most historians think that it was Mary Jane Kelly. This is just one of many misconceptions that get passed on through books and the media. Scotland Yard knew Mary Kelly was not the last victim just as the felt strongly that Mary Jane Nickols was not the first. According to Patricia Cornwell's best seller 'Jack the Ripper Case Closed' the Ripper went on killing right into the early 20th century. After Kelly the papers stopped printing much about the notorious killer. Things cooled down and it appeared that the Ripper was gone.
Trevor Marriott, a former Bedfordshire police detective has used modern police procedural techniques, to come up with a new theory about the Jack the Ripper murders (Jack the Ripper: the 21st Century Investigation). Marriott challenges the conventional wisdom that the murderer was a skilled surgeon. Moreover, Marriott says the location and timing of the killings - not far from London docks with gaps of several weeks in between - suggest the killer may have been a merchant seaman. Marriott thinks he may have identified the ship he arrived on - the Sylph, a 600-tonne cargo vessel which arrived in Britain from Barbados in July 1888, before the killing of the Ripper's first victim, Mary Ann Nichols, and which returned to the Caribbean on November 22, two weeks after the Kelly slaying, from where the same killer could have committed several similar murders in Managua in January 1889 described in a report in the Times as "six of the most atrocious murders ever committed within the limits of this city". //Although Marriott has put forth an entertaining scenario for the identity of Jack The Ripper, the dates do not match the facts. It is known now that the Ripper's first kill was most likely not Mary Ann Nichols and was probably not even Martha Tabram but may have started before Tabram's death. It is also believed that Mary Kelly was not JTR's last kill. His later victims are not well known by the average person but it is accepted as fact that the Ripper killed for years after Kelly's murder. There is no validity to theories that are based on a century of falsehoods and half-truths.//
By 1901 the murders committed by "Jack the Ripper" were slowly fading from the memories of the East End inhabitants. The murder of Elizabeth Roberts on the 26th November 1898 by her sister Kate Marshall brought "The Ripper's" name back into the public's attention only because Elizabeth Roberts was murdered in the room directly above 13 Millers Court, Dorset Street, where Mary Kelly was butchered on the 9th November 1888. Dorset Street the scene of the last murder attributed to "Jack the Ripper", had changed little if at all by 1901, "The Cardiff Weekly News" of Saturday 1st June 1901 was of the opinion: Dorset-street is a narrow, dirty street leading off Commercial-street, Spitalfields, and is one of those sordid thoroughfares which might with advantage to the community be swept out of existence.
For many years it was believed the Mary Kelly's murder on November 9, 1888, was Jack The Ripper's last murder. This simply is not true. A prostitute named Francis Coles was murdered in Whitechapel in 1891 who is now also thought to be killed by JTR. It is also most likely that Mary Ann 'Polly' Nichols was not the Ripper's first victim. At the very least Martha Tabram, who was found murdered several weeks before Nichols, was the Ripper's also. If this is true than Kelly would have been the Ripper's sixth victim, not the fifth.
Quite possibly, but as no one knew what he / she looked like no one can be sure.
For reasons that are not entirely clear, with the death of Mary Jane Kelly on November 9, 1888, the publicity surrounding the Ripper case more or less fizzled out, giving a false sense of security in London. The popular idea that Mary Ann Nichols was the first victim on August 31, 1888, or that Kelly was the last on November 9 is almost certainly not correct. So it's easier to keep track of the Ripper's crimes in years, not weeks. More than likely Martha Tabram, found murdered on Aug. 7, was a Ripper victim. There are possibly 2 or 3 before Tabram that may or may not be linked to JTR. It is also more than likely that the murders continued until 1891 and beyond. In 1907 a prostitute was found murdered, throat cut, in Camden Town, a neighborhood on the perimiter of Whitechapel.
The subject of Jack The Ripper is extensive so you want to just hit the highlights of the case. Making an outline first might be helpful. You need reference material. I recommend only two books for the reason that both authors used only the facts as opposed to building their books on misinformation. An example of this is the number of victims and the falsehood that Mary Ann Kelly was the last victim. The titles are Jack The Ripper A to Z written by Paul Begg and Jack The Ripper:Case Closed by Patricia Cornwell. You should be able to find both a the library. Start with a history of the crimes. Conditions of Whitechapel area at the time of the murders. The victims (all the victims, not just five).* Scotland Yard's search for the killer. List of viable suspects. The impact of the Ripper crimes and repercussions of the crimes. And then a conclusion. *victims section may include probably weapon and the killers MO (modus operandi) and possible description of wounds on bodies.
they usually last for 1-2 weeks