It was quite recently actually, first of all I suffer from nosebleeds so it happens quite a lot but they never last more than 5-10 minutes.
So anyway I was with my friends and my nose started to bleed so I went to the toilet and came back in a few minutes but then it just suddenly started bleeding really really bad, my face was covered in blood in seconds so I went to the toilet and a teacher saw me and took me to swimming pool (this is where people go when they get injuries in my school) which was on the other end of the school so I walked through the entire school grounds, my face and hands covered entirely in blood and everyone saw me.
When I got to the swimming pool the guy there started shoving a piece of tissue up my nose and when I said it hurt he said that it shouldn't hurt there unless it was injured in a fight, eventually he let me put it in and I was constantly tasting blood because of the way he made me put my head, I had to call my mother and get picked up from school that day and for the rest of the day all I could taste was blood, and for the next week (at least) everyone was making fun of me and insisting that I was in a fight because my lip happened to be cracked that day for a comletely different reason.
To me the nosebleed lasted hours but in reality it only lasted about half an hour.