Sa’d reported that he heard his father or his uncle say ; I witnessed the Prophet ﷺ while offering prayer. He used to stay in his bowing and his prostration as long as one uttera the words “Glory be to Allah and praise be to Him” three times. (Using translation from Abū Dāʾūd 885)   

رَمَقْتُ رَسُولَ اللهِ ﷺ فِي صَلَاتِهِ فَكَانَ يَمْكُثُ فِي رُكُوعِهِ وَسُجُودِهِ قَدْرَ مَا يَقُولُ سُبْحَانَ اللهِ وَبِحَمْدِهِ ثَلَاثًا