"We used to estimate how long the Messenger of Allah ﷺ stood when praying in Zuhr and 'Asr. We estimated that he stood in Zuhr for as long as it take to recite thirty verses, as long as Surat As-Sajadah in the fits two Rak'ahs, and half that in the last two. And we estimated that he stood for as long in the fits two Rak'ahs, and half that in the last two. And we estimated that he stood for as long in the first two Rak'ahs of 'Asr as he stood in the last two Rak'ahs of Zuhr, and we estimated that he stood half as long as that in the last two Rak'ahs of 'Asr." (Using translation from Nasāʾī 475)  

«كُنَّا نَحْزِرُ قِيَامَ رَسُولِ اللهِ ﷺ فِي الظُّهْرِ وَالْعَصْرِ» فَحَزَرْنَا قِيَامَهُ فِي الظُّهْرِ قَدْرَ ثَلَاثِينَ آيَةً قَدْرَ سُورَةِ السَّجْدَةِ فِي الرَّكْعَتَيْنِ الْأُولَيَيْنِ وَفِي الْأُخْرَيَيْنِ عَلَى النِّصْفِ مِنْ ذَلِكَ وَحَزَرْنَا قِيَامَهُ فِي الرَّكْعَتَيْنِ الْأُولَيَيْنِ مِنَ الْعَصْرِ عَلَى قَدْرِ الْأُخْرَيَيْنِ مِنَ الظُّهْرِ وَحَزَرْنَا قِيَامَهُ فِي الرَّكْعَتَيْنِ الْأُخْرَيَيْنِ مِنَ الْعَصْرِ عَلَى النِّصْفِ مِنْ ذَلِكَ قَالَ لَنَا أَبُو عَبْدِ الرَّحْمَنِ خَالَفَهُ أَبُو عَوَانَةَ  

"The Messenger of Allah ﷺ used to stand in Zuhr and recite the equivalent of thirty verses in each Rak'ah, then in the first two Rak'ahs of 'Asr he would stand for the equivalent of fifteen verses." (Using translation from Nasāʾī 476)  

كَانَ رَسُولُ اللهِ ﷺ يَقُومُ فِي الظُّهْرِ «فَيَقْرَأُ بِقَدْرِ ثَلَاثِينَ آيَةً فِي كُلِّ رَكْعَةٍ وَيَقُومُ فِي الْعَصْرِ فِي الرَّكْعَتَيْنِ الْأُولَيَيْنِ بِقَدْرِ خَمْسَ عَشْرَةَ آيَةً»