Oh look another topic about steam. As if we don't have 40 of those by now.
I've actually been tracking this for all RTB users for a few years now. Marble man you've played for like 1994 hours.
12.5 hrs on record
3 months, 2 weeks and 1 day
What about me? :)
http://returntoblockland.com/playtime.php?id=38824