The Prophet's ﷺ bowing, prostration, the time he remained standing after raising his head from bowing, and the time between the two prostrations were all nearly equal in length.
كان ركوع النبي ﷺ وسجوده، وإذا رفع رأسه من الركوع، وبين السجدتين قريبا من السواء.
Bukhari narrated it in the Book of Adhan (801), and Muslim in the Book of Prayer (471/...), both of them through Shuba, from Hakam, from Ibn Abu Layla, from Bara, and the wording is Bukhari's. Muslim also narrated it through Abu Awana, from Hilal bin Abu Humayd, from Abdul-Rahman bin Abu Layla, from Bara, who said, "I watched the prayer of the Prophet ﷺ and found his standing, then his bowing, then his straightening after his bowing, then his sajdah, then his sitting between the two prostrations, then his sajdah, then his sitting between the closing salutation and departure, to be nearly equal in length."Nawawi said, "This hadith should be understood as applying to certain particular circumstances. Otherwise, the earlier hadiths have established that he prolonged the standing, that he would recite in Fajr anywhere from sixty to a hundred verses, that in Dhuhr he would recite Surah Sajdah, that the prayer would be called and a man would go to Baqi to relieve himself, then return and perform wudu, then come to the masjid and still catch the first rakat, that he recited Surah Muminun until he reached the mention of Musa and Harun, that he recited in Maghrib from Surah Tur and Surah Mursalat, and in Bukhari from Surah Araf, and similar reports. All of this indicates that he ﷺ had different practices in prolonging the standing depending on the times."Hafiz said, "Some scholars responded to the hadith of Bara by saying that his statement 'nearly equal' does not mean that his bowing was equal in length to his standing, nor likewise the sajdah and the straightening. Rather, the meaning is that his prayer was nearly balanced overall, so that when he prolonged the recitation, he would prolong the rest of the pillars accordingly, and when he shortened it, he would shorten the rest of the pillars accordingly." Fath al-Bari (2/289).