It surprised me a few weeks ago that pokertracker informed me that my longest ever session was a minute under 4 hours when I made an unbelieveable $41, though I was reassured that the next longest was $494. Somehow this seemed short.
I remember when I first started out in poker and the prospect of really long sessions seemed exciting. I suppose playing 3 short handed tables online requires more attention than 1 live game. I'd say the internet is not the best place to remain somewhat 'grounded' while playing a 20 hour session.
Molina