This is very brief from what I have been able to gather, unfortunately Shafa’i fiqh books arn’t as easily available to me as the hanafi. The following is from Reliance of the traveller, what I will do inshaAllah is try an incoroprate on to this (and if neccessary more pages) as much as I can relating to women and the fiqh as approached by Imam Shafa’i.

If you have any further questions email me at:
seedsofrealisation @ googlemail . com
(remove the spaces )

I pray this is beneficialand please forgive me for my shortcomings.

The Menstrual Period

Minimal and Maximal Duration

The minimal age for menstruation is about 9 full years. There is no maximal age for the end of it, as it is possible until death.

The minimal mentrual period is a day and a night. It generally lasts 6 or 7 days. The maximal period is 15 days.

The minimal interval of purity between two menstruations is 15 days. There is no maximal limit to the number of days between menstruations.

Dusky-Colored Discharge, Intermittence, Etc.

Whenever a woman who is old enough notices her bleeding, even if pregnant, she must avoid what a woman in her period avoids. If it ceases in less than 24 hours (”the minimum”), then it is not considered menstruation and the woman must take up the prayers she has omitted during it.

If it ceases at 24 hours, within 15 days, or between the two, then it is menstruation. If it exceeds 15 days, then she is a woman with chronic vaginal discharge.

Yellow or dusky colored discharge is considered menstrual flow.

If a woman has times of intermittent bleeding and cessation during an interval of 15 days or less, and the times of bleeding collectively amount to at least 24 hours, then the entire interval, bleeding and nonbleeding, is considered menstruation.

Postnatal Bleeding (Nifas)

Postnatal bleeding (nifas) lasts at least a moment, generally 40 days, and at most 60. If it exceeds this, the woman is considered to have chronic vaginal discharge (Istihadha)

Actions Unlawful During Menstruation

All things unlawful for someone in a state of major ritual impurity (janaba) are unlawful for a woman during her menstruation and postnatal bleeding. It is also unlawful for her to fast then, and the (N: obligatory) fast-days she misses must be made up later, though not missed prayers.

It is unlawful for her:

-1- to pass through a mosque when she thinks some of her blood might contaminate it (N: and it is unlawful for her to remain in the mosque under any circumstances (n: when menstruating or during postnatal bleeding) ) :

-2- to make love, or take sexual enjoyment from what is between her navel and knees;

-3- to be divorced;

-4- or to perform purification with the intention to raise a state of ritual impurity.

When her bleeding ceases, then fasting, divorce, purification, and passing through the mosque are no longer unlawful for her, though the other things remain unlawful for her until she performs the purificatory bath.

Women with Chronic Vaginal Discharge (Istihadha)

A woman with chronic vaginal discharge (N: preparing to pray) should wash her private parts, apply something absorbent to them and a dressing, and then perform ablution.
She may not delay (commencing her prayer) after this except for reasons of preparing to pray such as clothing her nakedness, awaiting the call to prayer (adhan), or for a group to gather for the prayer. If she delays for other reasons, she must repeat the purification.

She is obliged to wash her private parts, apply a dressing, and perform ablution before each obligatory prayer (though she is entitled, to perform as many nonobligatory prayers as she wishes, carry and read the Koran, etc. until the next prayer’s time comes (or until her ablution is broken for a different reason), when she must renew the above measures and her ablution).