TIRMIDHI 477: from Fuḍayl b. Marzūq —
"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.'"

الترمذي ٤٧٧: عن فضيل بن مرزوق —
كَانَ نَبِيُّ اللَّهِ ﷺ يُصَلِّي الضُّحَى حَتَّى نَقُولَ لاَ يَدَعُ وَيَدَعُهَا حَتَّى نَقُولَ لاَ يُصَلِّي


Weak (ʿAli Zaʾī)
Tirmidhī > Witr (Night Prayer) > § What Has Been Related About The Duha Prayer
hadithunlocked.com