يُصَلِّي بِالتَّيَمُّمِ الْوَاحِدِ مَا شَاءَ مِنَ الْفَرَائِضِ وَالنَّوَافِلِ، وَصَحَّ تَقْدِيمُهُ عَلَى الْوَقْتِ
Under the Hanafi rule stated here, one valid Tayammum remains usable for multiple obligatory and voluntary prayers until something invalidates it. It may also be performed before the prayer time enters.
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Tayammum: Pillars, Sunnahs, Water Search, and Invalidators
يُصَلِّي بِالتَّيَمُّمِ الْوَاحِدِ مَا شَاءَ مِنَ الْفَرَائِضِ وَالنَّوَافِلِ، وَصَحَّ تَقْدِيمُهُ عَلَى الْوَقْتِ
Under the Hanafi rule stated here, one valid Tayammum remains usable for multiple obligatory and voluntary prayers until something invalidates it. It may also be performed before the prayer time enters.