Alright, I thought this would be a little interesting since I found one of my squadmates records. This thread was inspired by the "how many here are long-timers" thread.
The most I've logged in one tour is 115 hours.
If any of you remember ArtLaw.. he was my squadmate at the time, he must have been in a slump or out of work because he was logging up to 246 hours a tour - That's over 8 hours a day.