Ray.
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http://pmt.physicsandmathstutor.com/...%20A-level.pdf

how did they get 2 hours for question 4c? Mark scheme doesn't explain it
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jsg9
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My best guess is because 90% of cells are in interphase. You have 3% in stage A of mitosis and 1% in stage B. That leaves another 6% unaccounted for - they’re in stages of mitosis that aren’t shown.

So 3% + 1% + 6% (the cells in other stages of mitosis) = 10%. That means at any given time, on average, 10% of the cells are undergoing mitosis - hence, you can assume it takes them around 2 hours. 10% of 20 hours (for the whole cell cycle to complete) is 2 hours.
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