Easily 36+ hours straight of star wars galaxies. Even during the hour sof erver downtime I was working trades on the forums. I was a high end mover of highly quality product and sold some of my in game wealth for real money.
At one point when I was a doctor I would sell my buffs for 5 to 10 times the going rate of a standard "really top end buff" only mine were about 15-20 percent better.
Common players would complain, but my customers knew what they were getting and would gladly play. I catered to the uber wealthy as well, making it a known fact that they could pay double and skip to the front of the line.
Man I was engrossed in that game. Best crafting game ever and best or second best economy in an mmo