Are the first eight days of disturbed menstruation (six days of pure blood and two days of brown discharge) all considered menstruation, or is menstruation calculated by its initial duration (eight days)? And what must be done regarding the prayers missed because of that?

Yellowish and brownish discharges are considered menses if they occur during the usual period or are continuous with blood. However, any yellowish or brownish discharge seen after the cessation of blood and the sign of purity (either by dryness or the white discharge) is not considered menses. If prayers were omitted when they were obligatory, it is more cautious to make them up to avoid scholarly difference. If the exact number is not known with certainty, one should estimate and make up what is most likely to clear one's responsibility.