You should study until you feel confident. The best way is to do your work daily, so that you don't have to have a huge study session right before the test. Keep good notes and use those as study material, instead of trying to read the whole textbook again. Make a Study Deck and keep it with you all the time, so you can study anywhere.
Click on the related questions for specific study tips.
That depends on what subject, what grade the kid is in, how smart the kid is, if he pays attention in class, and what kind of test it is. The studying time could range from 5 minutes to 3 hours, depending on all of the above.
as long as you want to study.
It's a lifelong study.
they don't need to study at college
How long are acting colleges?
you must study to be a farmer for about 2 to 3 years
One which sets out to study a group of subjects over a long period.
As long as it takes to answer their questions.
it takes four years
Until your funding runs out. Or you die, I suppose, but you could always get students to carry on the study after you're gone.There's no real time limit (other than the natural ones such as how long you stay interested, how long you can afford financially to do it, and how long you live) to how long a study can go on.
It depends what you study there.
7 years
8 years