For humans, 28 days on average with menstruation ending on day 1 and ovulation occurring on day 14. But, every woman's cycle is different. Talk with your gynecologist for more information.
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28days roughly But anything from 24-35 is normal Most people establish at pattern, i.e. all periods are roughly the same length
no
Yes. Don't worry
Yes, it is perfectly normal for you to have a 40 day menstrual cycle. The typical menstrual cycle is 28 days but everyone is different so your cycles may be longer, also some cycles will be a few days longer or there can be reasons for delayed menstruation.
It takes about as long as a water cycle