well at AS i did about 10 minutes a day in exam month at the most :/ .. kind of regret it but meh however intending on doing about 2.5 hours a day from November this year .. hopefully.
I don't know if it's just me, lol, but I hate timetables... like if I make one, I just feel like a robot?
If you're not into timetabling like me, then I suggest you just go for it and revise for whatever feels right- like do what you want (obviously don't give in to yourself and revise for the shortest time possible, but make your revision feel as if you've actually understood something- rather than putting a timescale on everything).
e.g. To revise 5 pages of notes you made in class- this doesn't have to be done in 1 hour (or it could if you want!), but put it at a deadline of what suits you best- so this is how I would change this up: "2.5 pages of X on Monday, other 2.5 pages of X on Tuesday", along with other subjects too.
Just make sure you have some* sleep! (Lol, the irony as I type this at 04:37am)