How Many Hours Should I Study?

The number is supposed to be unwelcome

240 pages, 4 minutes a page, two passes:

32 hours.

Days remaining	Hours per day
21	1.5
10	3.2
5	6.4

The whole value of this calculation is doing it at the start, when material, passes or days can still change.

Almost everyone who has ever been surprised by an exam was surprised by this arithmetic. Most of them simply never ran it.

Why passes, not a single read-through

Because reading material once is not studying it, and a plan built on a single pass is a plan to have read the book rather than to know it.

Two or three passes is the normal shape:

1. Get through the material
2. Actively work with it
3. Review

The tool shows the hours for a single pass separately, so you can see exactly what each additional one costs. That's usually the first thing people trade away when the total looks impossible — and it should be a decision rather than an accident.

Minutes per page is not reading speed

This is the input that varies enough to change the answer completely, and the one people guess.

Ordinary prose reads at around 238 words per minute. A technical page you have to actually understand can take five or ten minutes. A problem set takes far longer than it looks.

Studying involves re-reading a paragraph, stopping to think, making notes, working problems, looking things up. None of that is reading speed.

Time yourself on one real page of the actual material. Not an estimate, and not a page you've already read.

When the number is impossible

Only three things can change:

• the material you cover
• the number of passes
• the days you have

Deciding which one gives is a real decision, and it's far better made deliberately in week two than discovered by running out of time in week fifteen.

The tool also shows days needed at a sustainable 3 hours a day. If that exceeds the days you have, the plan was never going to work and now you know while you can still act.

Sessions are more concrete than hours

"Fourteen hours" is a quantity. "Seventeen fifty-minute sessions" is a thing you can put in a calendar and count off.

It also makes the daily figure less abstract: more than three or four real study sessions in a day is rarely sustained for long, whatever the hours arithmetic says is possible.

Spacing beats total hours — and the calculator can't show it

The same number of hours spread across two weeks produces substantially better retention than the same hours crammed into two days.

This is one of the most robust findings there is about learning. It's free. And no arithmetic on the page expresses it.

So a comfortable hours-per-day figure is necessary, not sufficient. If the hours fit but they all sit at the end of the period, the plan is worse than the number suggests.

A large hours-per-day figure over very few days is precisely the pattern the evidence says works worst.

Not every page is worth the same hour

The largest limitation: it treats every page as equal, and they aren't.

An hour on the topic carrying a third of the marks is not the same hour as one spent on a footnote. Past papers and the syllabus weighting tell you where the marks actually are, and applying that will change your plan more than anything on this page.

Use the calculator for whether the plan fits. Use the syllabus for what goes in it.

And schedule the hardest material early — when there's still time to react to discovering it's harder than you thought.

Print the plan sheet — the daily log is the useful half, because the gap between planned and actual hours is the earliest warning you'll get.