my record is 40 hours
i was doing my dissertation
had so much lucozade to stay up
it comes in spells - between 25 and 30 its so hard. Then it eases up a bit and then hits you harder. Went to bed for 14 hours after the 40 hour stint. Hopefully never again. Its a horrible feeling. Thought i was going to pass out and die at times but i had to write 4000 in one final night, do footnotes, bibliography, appendices and print the 15,000 word beast out
Somehow i passed!