The World Federation One Stop Fiqh

Ruling 279

If there is so little time [before the end of the prescribed time for prayers] that by performing wuḍūʾ the entire prayer or part of it would have to be performed after its time, then one must perform tayammum. However, if the time required for performing tayammum and wuḍūʾ is the same, then one must perform wuḍūʾ.