Anas used to demonstrate to us the prayer of the Prophet (ﷺ) and while demonstrating, he used to raise his head from bowing and stand so long that we would say that he had forgotten (the prostration).
Sahih al-Bukhari Book 10, Hadith 195
← Previous Hadith One day we were praying behind the Prophet. When he raised his head from bowing, he said, "Sami`a l-lahu liman hamidah." A man behind him said, "Rabbana wa laka l-hamdu, hamdan kathiran taiyiban mubarakan fihi" (O our Lord! All the praises are for You, many good and blessed praises). When the Prophet completed the prayer, he asked, "Who has said these words?" The man replied, "I." The Prophet said, "I saw over thirty angels competing to write it first." Prophet rose (from bowing) and stood straight till all the vertebrae of his spinal column came to a natural position.

Sahih al-Bukhari Book 10, Hadith 194 Next Hadith → The bowing, the prostrations, the period of standing after bowing and the interval between the two prostrations of the Prophet (ﷺ) used to be equal in duration .

Sahih al-Bukhari Book 10, Hadith 196