(121) باب حَدِّ إِتْمَامِ الرُّكُوعِ وَالاِعْتِدَالِ فِيهِ وَالاِطْمَأْنِينَةِ
Narrated Al-Bara:
The bowing, the prostration the sitting in between the two prostrations and the standing after the bowing of the Prophet (ﷺ) but not qiyam (standing in the prayer) and qu`ud (sitting in the prayer) used to be approximately equal (in duration).
Reference: Sahih al-Bukhari 792
In-book reference: Book 10, Hadith 187
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 12, Hadith 758