'Abdurrahmaan bin Abi Layla RA. (a Taabi'ee) reports:
"None had given me the news that they had observed Messenger of Allah ﷺ perform the salaatut duhah besides Ummi Haani. She said: Messenger of Allah ﷺ came to her house, the day Makkah was conquered. He performed ghusl (bath), then performed eight rak'ahs. I did not observe Messenger of Allah ﷺ perform any salaah shorter than these, despite him performing every ruku' and sajdah properly"'. (He did not perform the ruku' and saidah haphazardly because the salaah was short).

حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ: حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، قَالَ: حَدَّثَنَا شُعْبَةُ، عَنْ عَمْرِو بْنِ مُرَّةَ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى، قَالَ: مَا أَخْبَرَنِي أَحَدٌ، أَنَّهُ رَأَى النَّبِيَّ ﷺ يُصَلِّي الضُّحَى إِلا أُمُّ هَانِئٍ، فَإِنَّهَا حَدَّثَتْ أَنَّ رَسُولَ اللهِ ﷺ، دَخَلَ بَيْتَهَا يَوْمَ فَتْحِ مَكَّةَ فَاغْتَسَلَ فَسَبَّحَ ثَمَانِيَ رَكَعَاتٍ مَا رَأَيْتُهُ ﷺ، صَلَّى صَلاةً قَطُّ أَخَفَّ مِنْهَا، غَيْرَ أَنَّهُ كَانَ يُتِمُّ الرُّكُوعَ وَالسُّجُودَ.