The prayers of the Messenger of Allah ﷺ and the prayers of Abu Bakr were close in length, until Umar lengthened the morning prayer.
حدثنا ابن أبي عدي عن حميد
كانت صلاة رسول الله ﷺ متقاربة وصلاة أبي بكر حتى بسط عمر في صلاة الغداة
Its isnad is sahih, previously mentioned in 12055.