1000 hours is nothing. I had well over 400 days played time in WoW when I was still on that game. And I'm not the kind of guy who leaves his electronics on when they're not in use.... so that time is almost entirely ACTUAL played time.... this means I played for a good 10 000 hours at least (from BC to WoD)
I have like 1500 hours at least in TF2 because i played almost 600 hours on xbox 360, then moved to PC, but also played more on an alternate acount. Next is KF1, also played it like 200 hours more in 2 different accounts, but overall in all my gaming life, DooM 1-2 i have played thousand of hours, because every now and then i play it again to try new maps/mods.