The scenario that can occur with menstruating women: What does she do if she is still discharging istihatha after a maximum of 15 days?
She needs to change her pads and refresh her wudu for each prayer. If she feels that she was discharging the istihatha during the prayer, her prayer is still valid.
Is there any evidence of the scholars’ limitations of the minimums and maximums of menses?
No, there is no evidence. Ibn Taymiyyah pointed this out. If there is no evidence for limits to cycle lengths, why put a limit?
