وَيَبْطُلُ وُضُوءُ الْمَعْذُورِينَ بِخُرُوجِ الْوَقْتِ
Under the rule stated here, the concessionary Wudu ends when the relevant prayer time exits. If Ma'dhur status continues, a new Wudu is made for the next prayer time.
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When the Prayer Time Ends
The Excused Person (Ma'dhur): Practical Prayer-Time Rulings
وَيَبْطُلُ وُضُوءُ الْمَعْذُورِينَ بِخُرُوجِ الْوَقْتِ
Under the rule stated here, the concessionary Wudu ends when the relevant prayer time exits. If Ma'dhur status continues, a new Wudu is made for the next prayer time.