The longest game
I think it's oblivionSilent Hunter 3 and 4, if you do not use acceleration of time the passage of a single campaign, you can spend up to 6 years of playing (that's hours of gameplay), and I accelerated only up to 1942. was able to play. Il-2 is similar, but approximately half as long(after all, planes are not the months the tasks are performed), however this is more than kompensiruet a huge number of campaigns.
I think Someone of you knows the game front mission 3 here it is really long, about 180 hours of game play)) by the way all were still on the PSone.
by the way, I heard that scientists have calculated-on to win in Tetris you need to spend about 36 years of playing.
Monster Hunter is about 450 hours of gameplay on the company, and somewhere in 1000 hours-that-be to collect the coolest sets.