28 days, +/-: 28 days from the first day of bleeding until the next first day of bleeding is the textbook answer. Periods that start spontaneously anytime from 26-32 days are normal and can mostly be considered regular. The same day or date each month is not a good defnition, months range from 28-to-31 days in length, rmeber? Good luck!
Answered 3/8/2016
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