Sunan Abi Dawud Book 2, Hadith 415
The Messenger of Allah (ﷺ) used to recite in the noon and afternoon prayer: "By the Heaven and the Morning Star" (Surah 86) and "By the Heaven , holding mansions of the stars" (Surah 85) and similar surahs of equal length.
We used to estimate how long the Messenger of Allah (ﷺ) stood in the noon and the afternoon prayer, and we estimated that he stood in the first two rak’ahs of the noon prayer as long as it takes to recite thirty verses (of the Qur’an), such as A-L-M Tanzil al-Sajdah. And we estimated that he stood in the last two rak’ahs half the time he stood in the first two rak’ahs. We estimated that he stood in the first two rak’ahs of the afternoon prayer as long as he did in the last two at noon; and we estimated that he stood in the last two rak’ahs of the afternoon prayer half the time he did in first two.
When the sun declined, the Messenger of Allah (ﷺ) offered the noon prayer and recited surahs lie "By the night when it covers over" (92) and (recited similar surahs) in the afternoon prayer, and in the other prayers except the dawn prayer which he used to prolong.