A female used diaphragm, after sex how much time she should kept diaphragm inside the uterus?

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart C (pp 404-604 of 604) p. 188-190
E6 Obstetrics Williams p. 84-89
Practise the full AIIMS Rishikesh & Jodhpur NO - 2017
Attempt every question from this paper in a timed mock, then review the full solution for each one.