Question

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Answer

There is no maximum limit for tahir (paak) time between two menses however, the minimum period of haiz (periods) is three days and three nights and the maximum period is ten days and ten nights. Blood which flows for less than three days and three nights is not haiz but it is referred to as istehaaza (flowing of the blood out of the normal period).
This happens on account of some sickness or weakness of the body. If blood flows for more than ten days and then nights then all those days beyond ten days will be regarded as istehaaza.

The rule in regards to istehaaza is the same as for the one whose nose bleeds continuously. Such a woman should offer her salaat, fast, and should not leave out these. It is also permissible to have sexual relation with her husband.

A person who is facing istehaaza undergoes the same proceedure as a mazur. This woman is to make wudu at the time of every salaat. As long as that salaat time remains her wudu will remain, she can read the salaat of that
time and read Quran just as anyone else. However, if apart from this bleeding some other matter crops up which causes her wudu to break, then her wudu will break and will have to repeat the wudu. (Bahishti Zewar 72,100)
 

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