About 80 hours is my record. I had a final paper to finish writing and plenty of time to finish it, but my brain was completely fried from lack of sleep. I was afraid that if I went to bed I wouldn't be able to get up in time to finish my paper, but I had no other choice. So I went to bed, and miraculously got myself up a couple hours before the deadline and turned in my paper with about 30 minutes to spare. Passed the class.