Depends on how close the exam is/how much I set myself to revise. Can be anything from a 1-4 hours, but any more than that and I feel Im not actually retaining any information, so it's a waste of time. But that's just me, everyone is different when it comes to revising. :P
I try and do at least 2 past papers a day (for different subjects) and go over notes in areas I struggle with, as for how long has lately been around 2-3 hours It used to be longer but I'm on a motivation flop at the moment
During the school week (i.e. about a few weeks before an exam season) I try and do 1-2 hours of revision (depending on what time I finish school), whereas on the weekend I'll do about 3-4 hours. During this half-term, I'm trying to do an hour of each subject (2 hours for two History exams, 2 hours for two Maths exams and 1 hour for one Chemistry resit), so hopefully around 4-5 hours a day
Okay I'm either the only person not lying or my results are going to be terrible... 4 hours?! I dont spend that long the day before the exam! An hour a day is more than enough if it's successful
I'm doing a booklet a day at the moment but i know i should be doing more because i have got my first A2 exam on the 3'rd June. Been re-playing Fallout New Vegas though.