sitifan The time required learning each chapter will depend on the student’s ability and background. "? Quired is wrong here but if you mean required , that's what I would say.
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sitifanThe time required learning each chapter will depend on the student’s ability and background.Quired is wrong here but if you mean required, that's what I would say. The gerund learning is plainly wrong.
Why not use "The time quired to learn ..."?