15 days
and I don't cheat unlike some others *cough*
110 days, 15 hours and 58 minutes, and I haven't cheated... Yet.
How do you cheat? I assume it's running BLF in the backround.
If you know how to you can make something that'll refresh the main page every 10 minutes or so to make it keep you logged in.
Your profile will say you're off-line if you haven't visited a page in 15 minutes.