Sa'di, may Allah have mercy on him, narrates from his father or uncle that I have observed the manner of the Prophet Muhammad's (peace be upon him) prayer. The Prophet Muhammad (peace be upon him) used to remain in bowing (ruku') and prostration (sajdah) for the duration in which "Subhan Allah wa bihamdihi" could be said three times.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22329
Hadith Gradingحکم دارالسلام:إسناده ضعيف لجهالة السعدي ومن فوقه