Well 2 days ago/one day ago (I ran into two days doing this essay) I was doing an essay for 9 hours. Start at 6pm, finished a 3am.
Piece of coursework worth about 10% of my GCSE, I got 52/54 for it
.
OTOH I have had around 6 hours of sleep in the last 48 hours (I got 3 hours because of doing the essay and only got 3 hours today because of bloody hayfever).