Duration: bleeding shorter than three days is istihadah, and excess beyond the ten-day maximum is not hayd.
Worship: menstruation suspends prayer without make-up, while fasting is prohibited and missed obligatory fasts are made up.
Purification: cessation, ghusl, mushaf handling and recitation follow distinct rules.
Disputed matters: intervening purity and the exact time bleeding stops require analysis of the particular facts.