It took Charles Babbage 9 years to get the computer right.
It took my brother about 4-5 hours. But its a good computer.
Perhaps it will not take as long as some think to build a computer complex enough to duplicate the human brain.
Depends on what you mean by from scratch, and what kind of computer. Anywhere from minutes to years.
25 years
25 years
it took 50 years to build it was the wrights plane
2 years
5 weeks
Before you ask the questiion how long did it take to build, you must first ask yourself, "did they have enough financial support to build the International Finance Center?"
how long does it take to build a asimo
223 years