This is probably the most-asked revision question and the worst-answered one. Someone in your year claims to do eight hours a day. Someone online says two is plenty. Your school says "little and often" without ever saying how little or how often. All of these answers fail for the same reason: they count the wrong thing.
Hours at a desk are not the unit that matters. What matters is effective hours — and once you count those instead, the whole question gets easier.
Count effective hours, not desk hours
An effective hour is one spent doing something that forces retrieval or produces marks: answering questions with the book closed, doing a past paper, marking one honestly against the scheme, doing flashcards properly, writing a topic from memory and checking the gaps.
An hour spent re-reading notes, copying them out neatly, or watching videos without ever pausing to attempt anything is desk time, not revision. It can feel identical from the inside — that is the trap. The test is simple: did this hour produce wrong answers you then fixed? If nothing was ever wrong, nothing was really tested.
If you got nothing wrong today, you did not revise today. You performed things you already knew.
This is why the eight-hour claim never impresses me. Eight desk hours usually contains two or three effective ones, plus five hours of increasingly tired page-turning that mostly serves the story "I worked hard today."
The ceiling is lower than you think
Real retrieval is tiring, and the quality collapses well before your willingness to sit there does. For most students, three to four genuinely effective hours in a day is close to the ceiling — and reaching even that requires breaks, because a fourth consecutive hour of past-paper work is worth a fraction of the first.
That has a liberating consequence: the student doing three sharp hours with proper breaks is not lazy compared to the eight-hour marathoner. They are usually learning more, and they will still be doing it in May when the marathoner has burnt out.
What the year should actually look like
The right number moves through the year, so here are honest benchmarks rather than one figure:
- Normal term time (Year 11 or 13): around an hour a day on weekdays, a little more at weekends. The goal here is not volume — it is keeping old topics warm with spaced retrieval so exam season is not archaeology.
- Easter holidays: four to five structured hours a day, built as blocks with real breaks between them, and at least one full day off a week.
