Ahn'Qiraj, Josh! but i suppose it's Naxxramas now, since AQ is old.
anyhow, i've been officer in the 10th 'best' wow guild worldwide until recently and i never ever spent 100 hours a week on it though. thats just sick. even for someone that's been in the endgame, like me.
i played 25 hours a week back then, i think. but you'd also have to add the officer crap that comes with it when you aren't playing.
the only 2 logical explanations for playing 100 hours a week is: 1) pvp, going for r14 & 2) being a chinese farmer.
now, sadly, your friend isn't the only one. there are people out there that got insane amounts of /played time. my /played on my main was 75 days, alt was 20 i believe. (yes, thats sick too, i know)
you should ask your friend for his /played, Josh.