فَإِذَا خَرَجَ الْوَقْتُ بَطَلَ وُضُوؤُهُمْ، وَكَانَ عَلَيْهِمُ اسْتِئْنَافُ الْوُضُوءِ لِصَلَاةٍ أُخْرَى.
Meaning: When the prayer time ends, their wudu becomes invalid, and they must renew wudu for another prayer.
Under the stated Hanafi rule, the concessionary wudu ends at the exit of the prayer time. A new wudu is needed for the next time even if no unrelated nullifier has occurred.