وَتَتَوَضَّأُ الْمُسْتَحَاضَةُ وَمَنْ بِهِ عُذْرٌ لِوَقْتِ كُلِّ فَرْضٍ، وَيُصَلُّونَ بِهِ مَا شَاءُوا مِنَ الْفَرَائِضِ وَالنَّوَافِلِ، وَيَبْطُلُ وُضُوءُ الْمَعْذُورِينَ بِخُرُوجِ الْوَقْتِ فَقَطْ
An established Ma'dhur performs Wudu for each obligatory-prayer time. Within that time, the continuing excuse itself does not invalidate the concessionary Wudu, and the person may perform Fard and Nafl prayers. Other ordinary invalidators still break Wudu. Under the rule stated here, the concessionary Wudu ends when the prayer time ends.