50 to 55 hours myself. I had to write a 30 page paper my first years in college and completely blew it off. (Research and all.) I finished it in about 40 hours, but my computer crashed when printing it out. I reloaded the program and I lost about 10 pages. I was sooo tired I could barely remember what the hell I was writing about. Anyway, I ended up in the bathroom at about the 48th hour laughing my ass off at nothing. I also experienced colorful hallucinations and extreme dizziness.
BTW: My prof. ended up giving me one of my few Cs in college. “A hodgepode of facts,” he called it. Duh, no shit.