What is the ruling on the prayer of a woman from whom blood issues during her working hours and she is unable to change her clothes, knowing that her working hours are continuous from 9 AM to 5 PM?

Purity from impurity is a condition for the validity of prayer. If your garment is affected by impurity and you cannot change it, you must wash the place of the impurity and then pray. It is not permissible to pray with impurity if one is able to remove it. Whoever prays knowing of the impurity, their prayer is invalid and must be repeated. Ibn Taymiyyah is of the opinion that whoever prays in ignorance of the impurity should only repeat the prayer of the current time and not repeat past prayers. However, if it is impossible to remove the impurity or change the clothes, some scholars are of the opinion that there is an exemption for impurities that are difficult to guard against in prayer.