Musnad Ahmad 658:162

'Abdah ibn Sulayman al-Kilabi narrated to us, Mis'ar narrated to us, from al-Hakam, from 'Abd al-Rahman ibn Abi Layla, from al-Bara' who said: "The bowing of the Messenger of Allah (may Allah bless him and grant him peace), his standing after bowing, and his sitting between the two prostrations were [of such duration that] we could not tell which of them was longer."