How long does it take to beat this game?

[Michael-5]

Gran Turismo 3 - 100% completion 140 hours. This is a close friends completion time, I only get about 12% in the end. He beat GT3 100% in two and a half solid weeks of playing, approximatly 7 hours a day. Whoever typed 900 hours must have obtained every car, but to complete all the races and get 100% completion it's much less. I wouldn't consider purchasing every car as 100% completion. I don't know anyone who has maxed out GT1,2,4 or 5.