When discussing the rulings of Haydh or Istihadha, how many hours are meant by three days or ten days?

Answer

Three days is considered as 72 hours from the commencement of bleeding, and ten days as 240 hours. However, if for instance, bleeding commenced at 10:00 pm on Saturday (bleeding starts at night not at day), then one is not required to wait till 10:00 pm on Tuesday, rather on sunset of Tuesday will be the completion of three days, and also the sunset of the following Tuesday will be the completion of 10 days.