Yellow - 51:22
Crystal - none (internal battery issue; had hundreds of hours years ago)
Colosseum - 40 or 50 (too lazy to check)
LeafGreen - 81:22
Emerald - 260:20
XD - 50 or 60 (too lazy to check)
Mystery Dungeon: Blue Rescue Team - 80 or 90 (too lazy to check)
Pearl - 178:50
SoulSilver - 116:09
Black - 91:55
Total - Between 949:58 and 979:58
It should be noted that I used to have Ruby, Sapphire, and two other LeafGreens, each with 100 to 200 hours on them.
Anyway, wow. My friends have called me a geek, but when I see the playtimes some people here have, I feel painfully inadequate as a Trainer. One of my friends quit Pokemon three years ago, but when he played, he owned almost every game and had at least 200 to 300 hours on each one. That's dedication.