Each year I am experiencing less and less of these 'time skips' while gaming.
Before I could sit for hours on end, not even noticing the time as it flew by. Nowadays however, all I can stomach in a sitting is about 2hrs before I feel strong psychical need for a 30min break, then I can hit it again. Playing online I have been known to really push it in the past, but that had less to do with me enjoying my gaming time, but more about remaining competitive. Maybe age has something to do with this change of pace?