FFXI....i estimate atleast 9,960 hours (before i quit my play time was pretty much 1 year (350 days or so) plus what i've got since i started playing again... btw playtime is actual time you've spent on the game, not how long you've been a member)

MOH:AA i know i put in atleast 2,000 hours on that...
BF2 i have 161 ( slipknotpsycho Gunnery Sergeant Stats, BF2S.com )
Gunbound, there's no telling... probably atleast 1,000...
Resistance probably a few hundred by now... i've nearly climbed my way to the top rank (3 more stars to go)