Sahih Bukhari
Characteristics of Prayer
Volume: 001 / Book Number: 012 / Hadith Number: 758
Narrated Al-Bara:
The bowing, the prostration the sitting in between the two prostrations and the standing after the bowing of the Prophet but not Qiyam (standing in the prayer) and Qu'ud (sitting in the prayer) used to be approximately equal (in duration).