"The Prophet would pray Ad-Duha until we would say: 'He will not leave it.' And he would leave it until we would say: 'He will not pray it.'" (Using translation from Tirmidhī 477)
كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي الضُّحَى حَتَّى نَقُولَ لَا يَدَعُهَا وَيَدَعُهَا حَتَّى نَقُولَ لَا يُصَلِّيهَا