The question is finally answered
Tic Tac Toe -> hours
Breakout -> weeks
Tetris -> weeks
Space Invaders -> a few months
Shoot em up like R-type -> 6 - 18 months
Pacman type game -> weeks
2D Platform game -> 6 months
Nethack Style RPG game -> months
simple 2D RPG game -> 1 - 2 years
simple 3D RPG game -> more than 2 years
simple Multiplayer 2D RPG -> 1 - 3 years
very simple 3D shooter -> 1 year - 2 years
3D shooter on par with Quake -> 5 years
3D shooter on par with Quake 4 -> 10 years
3D shooter on par with Crysis -> 50 years
MMORPG like World of Warcraft -> 200 years
~RIchard James13
(
http://ubuntuforums.org/showthread.php?p=8148639#post8148639 )