If a legally excused person makes wudu after Zuhr time begins, that wudu can be used for Zuhr and other permissible prayers within that time.
The controlling factor is not the number of prayers but the continued prayer time; an unrelated nullifier still requires a new wudu.
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Istihadah, Excused Persons and Nifas
If a legally excused person makes wudu after Zuhr time begins, that wudu can be used for Zuhr and other permissible prayers within that time.
The controlling factor is not the number of prayers but the continued prayer time; an unrelated nullifier still requires a new wudu.