I completed over 40 games in a few months, this year.
There's plenty of games that can be completed in an hour, so 3000 hours. 3.75 months. Note completing games is pretty meaningless for just about anyone relative to playing good games or playing hard games and what have you. There's maybe 200-300 games objectively worth playing and another 500 or so that you'll like according to taste; that leaves 2200 garbage games to go through.
@tycobb: I wanted to see your conclusion based on your own experience, I did not completed them in three months, but more. It would take me over 16 years only for FPS/TPS games . If RPGs, RTS and racing games are included in the 3000 list, then definitely over 20 years - for me.
~ It's just a simple question, we all have odd/lame curiosities sometimes.
@ Gotcha. Did not realize you were asking us for our personal time since you didn't list out how many years it would take you.
Me, more than a lifetime. I rarely finish games. I play until I no longer care or something new comes along. I maybe complete 2 or 3 games a year.