Is it the case that the menstrual period extends to nine days if this duration recurs intermittently, or is it a condition that it recurs three consecutive times?

If a woman sees blood during a time when it could be menstruation, then it is menstruation. The nine days in which she saw blood are considered menstruation, even if it exceeds that, as long as it does not exceed fifteen days. As for the opinion that requires the habit to be repeated three times, it is not a condition for the repetition to be consecutive.