Also, do you count your breaks in those times?I hope so. I don't know of any human who is able to study 10 hours straight. Breaks would also provide you with sufficient time to recuperate and allow the learning to set in (read up on active learning).
Any tips for staying disciplined for those long hours?If it's just an entire day reserved for studying/revision (as opposed to a school day where you have to go to school and have entire schedule interrupted), then I would try to use something similar to the pomodoro technique (25 mins focused studying + 5 min break); I would work at something for 2 hours straight, then I have a 15 min - 30 min break, then follow by another 2 hours, then another break, etc. You should find that this is similar to how your school schedule their lessons (things are structured like they do for a reason).
The average human has a certain amount of will power in any given day, so you should prioritise doing the more difficult stuff first in the morning, and then the easier stuff later on in the day (the 'eat that frog' principle). You will quickly find that by Hour 7 or 8, your attention and ability to focus will start to wane. This is your body telling you that you are at your limit. Wind down during this period by studying something you're good at.
There's also something you might want to look up: how to stay in flow. The flow state is a state of mind where you would be in 100% focus and it feels like you're in your element/things seem effortless (you should have come across this state of mind quite a few times, but maybe not sure what it's called). There's a huge book written by someone who came up with the term, but I don't think it's required that you should read it. The following videos should give you an introduction:
https://www.youtube.com/watch?v=znwUCNrjpD4https://www.youtube.com/watch?v=Olhr_kBirAshttps://www.youtube.com/watch?v=0PGar1jQSVIhttps://www.youtube.com/watch?v=6YBkpnMccrEhttps://www.youtube.com/watch?v=lwX8d5ebnmcIt would be worth your while to look up more about this state of mind.
It takes a while in order to practice getting into the state, but it's possible to condition yourself to get into such state in a short period of time. It would realy come in handy when it comes to your exams. The main preconditions are usually:
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It needs to be something you're interested in
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It's something you enjoy/like
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It needs to be something you have a good grasp or semi-level of mastery in
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It needs to be something a little challenging
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It needs to be something you can do so with minimal interruptions
There might be more, depending on the subject, circumstances, and you as a person.
It might also help to mark down your progress throughout. If it seems endless and it doesn't feel like you're getting anywhere, it can start to feel like a 'chore'. I would also focus on areas where you can improve the most and the weakest areas you would need to work on (introduce some active thinking).
Having said that, it doesn't mean that it's not possible to sit at the table and work for 10 hours straight on something. However, that's usually something you have a firm mastery of, and it's usually very rare and for very particular projects; people still take breaks throughout.
When it comes to productivity and studying, I usually refer to Thomas Frank (American) and Ali Abdaal (British). I don't know the specific subjects you're studying or what you enjoy studying, so these are probably the best people for general advice.