Been gaming everyday since 1991 piling up countless hours on the Commodore Amiga 500 and then onto pc gaming in 1994. Here are a few that have kept me til dawn:
Dungeon Master (Amiga) easily an all nighter til 5am.
Black Crypt (Amiga)
Eye Of The Beholder 1+2 (Amiga)
Battleforce (Amiga, Battletech game by Ralph Reed)
Elvira horror rpgs (Amiga)
GODS (Amiga)
DOOM (pc)
BLOOD (pc)
Might And Magic 6-7-8 ten hours a day for years.
Unreal Tournament many an afternoon for five or six hours.
The Elder Scrolls Daggerfall usually from 10pm to 5am.
The Elder Scrolls Morrowind so many hours and days rolled into years.
The Elder Scrolls Oblivion, I got no memory, I got no recall of anything at all
The Elder Scrolls Skyrim going on 400 hours pretty soon.
Fallout 3 four to five hour stretches daily until Skyrim came out.
Fallout 4 about to hit 900 hours and counting.
The original Starcraft from 7pm to 6am against my brother inlaw along with many a five hour afternoon deathmatch of Hexen, Heretic, Age Of Empires.
Yes this is my hobby.