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The normal cycle length is ( 21 to 35 days, 20 to 30 days, 21 to 30, 18 to 35 ). The normal length of menstrual flow is ( 2 to 8 days, 1 to 8 days, 3 to 9 days, 4 to 7 days ). The normal amount of menstrual blood loss is ( 20 - 80 ml, 10 - 90 ml, 20 - 40 ml, 10 - 100 ml ).