SvennoJ on 04 December 2017
That would be Everquest. Played from mid 2000 to early 2005 (switched to WoW) at an average of 3 to 5 hours a night during the week, upto 12 hours a day/night in the weekends, more when raiding until early morning. The game measured time played in weeks and days, it was a lot. Easily over 5000 hours total.
