السلام عليكم According to Sh. Ibn Baz’s view that the maximum length of menstruation is 15 days, how are those 15 days calculated? For example, if haidh begins at Maghrib and continues beyond 15 days, does the limit end at Maghrib of the 16th day, or must she begin praying at Fajr of the 16th day?

Ustadh AbdulAziz al-Haqqan

This is the saying of the hanabilah but the correct saying as imam assadi mentioned there is no set limit. It could be haydh or istihadhah.