How Many Hours a Day Should I Revise

Why there is no single right number

Searches like "how many hours a day should I revise for GCSEs" or "for A levels" expect one figure. The sources that study learning or give official advice do not offer one, and that is honest rather than evasive. The right amount depends on:

• How far away your exams are. Two hours a day for six months is a very different load from two hours a day for two weeks.
• How many papers you sit. A student with ten GCSEs has more ground to cover than one with three A levels, though each A level paper may need more depth.
• What else is in your day. School hours, homework, travel, a part-time job and sleep all come first.
• How you use the time. An hour of past paper questions is worth more than an hour of rereading notes.

So instead of a target number, it helps to know what each source actually says and build your own figure from that.

What the NHS says

The NHS page on preparing for exams, written for teenagers and young adults, advises:

• Make a realistic revision schedule and break the work into manageable chunks.
• Aim to do a few hours of revision each day, and mix up your subjects so you do not get bored.
• Take regular short breaks, because studying for hours and hours will only make you tired, ruin your concentration and may make you more anxious.
• Do something physical when you are not revising. Exercise helps take your mind off stress and helps you sleep.

"A few hours a day" is deliberately loose. Treat it as a sensible range for exam season, not a minimum you fail if you miss.

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The daily number depends on how many days you have left, which is what Exam Countdown shows. It keeps each exam's countdown on your home screen with a free widget, so you can see whether you have months for steady sessions or weeks for a heavier push. Reminders can go off on exam day or any number of days before, at your chosen time. The free version holds 5 countdowns; Pro removes ads and unlocks unlimited countdowns.

How long each session should be

Advice on session length differs depending on who it is for, so it is worth knowing where each figure comes from.

• UNC Chapel Hill's Learning Center, writing for college students, describes intensive study sessions of 30 or 45 minutes using active strategies such as self-testing, followed by a break. It says shorter, intensive sessions are more effective than drawn-out studying, and that planning hours of nonstop self-testing is likely to cost you attention.
• The University of Reading's Study Advice team, writing for university students, suggests working in blocks of two to three hours with minibreaks, then changing to a different module so you feel refreshed.

These fit together. A block of two to three hours can be made of several 30 to 45 minute bursts with short breaks between them. If you are younger, or new to revising, start at the shorter end and build up.

Spacing beats long days

The strongest evidence is not about hours per day at all. It is about how revision is spread out.

A review of ten common learning techniques, published by the Association for Psychological Science and by Dunlosky and colleagues at Kent State, Duke, Wisconsin-Madison and Virginia, rated two techniques as high utility: practice testing and distributed practice, which means spreading study sessions out over time. It found these helped students of many ages and ability levels. Rereading, underlining and mnemonic devices were rated low utility.

UNC's Learning Center describes distributed practice as one of the most impactful learning strategies. Its point is that the total time can be the same as one or two marathon sessions, but spacing it across days and weeks means you learn more deeply and remember more. In its words, what matters is how you use your study time, not how long you study.

In practice this means:

• Starting earlier lets you revise fewer hours a day.
• A little on each subject most days beats a whole day on one subject.
• Testing yourself, then testing again the next day, is a good use of short sessions. Reading's guide suggests exactly that.

A way to work out your own number

1. Count the weeks to your first exam. Use your official exam timetable. If yours are UK exams in 2027, see GCSE and A level exam dates 2027.
2. List your papers and topics, and mark the weak ones.
3. Estimate how many sessions each topic needs. A weak topic might need several; a strong one might need one review and some practice questions.
4. Divide the total by the weeks you have. That gives a number of sessions per week, which you can turn into hours.
5. Check it against your real week. Take out school, travel, meals, sleep and at least one free day, which Reading recommends keeping for relaxation.

If the number you get is not possible, the fix is usually to start sooner or to focus on the topics most likely to gain marks, not to cut sleep. Our guide on how to make a revision timetable walks through turning this into a weekly plan.

Signs you are doing too much

More hours are not always better. The NHS links long study stretches with tiredness, poor concentration and anxiety. Reading's guide says studying is mentally tiring and cannot be kept up at a high level for long periods, and that your brain needs downtime, exercise, food and sleep. YoungMinds advises being real about what you can do in a day, and says a plan should keep you on top of things, not leave you burnt out.

Watch for:

• Reading the same page several times without taking anything in
• Struggling to sleep, or sleeping much less to fit in more revision
• Feeling guilty every time you stop
• Dropping exercise, meals or friends completely

If these sound familiar, shorter and better-planned sessions will likely do more than longer ones. For support with the pressure itself, see how to deal with exam stress.

The short version

• No official body gives a fixed number of hours.
• The NHS suggests a few hours a day, with subjects mixed and regular short breaks.
• Sessions of 30 to 45 minutes, or blocks of two to three hours with minibreaks, are both used in university study advice.
• Spreading revision over weeks and testing yourself matter more than the daily total.
• Keep sleep, food, exercise and a free day in the plan.