Sahih al-Bukhari 541

It is related from Abu Barza, "The Prophet, may Allah bless him and grant him peace, used to pray Subh when it was possible for someone to recognise the person sitting next to him. In it he would recite between sixty and a hundred ayats. He would pray Dhuhr when the sun began to decline and 'Asr at a time when it would still be possible to go to the furthest part of Madina and back with the sun still white." Abu'l-Minhal said, "I forgot what he said about Maghrib." "He did not mind delaying 'Isha' until one third of the night had passed." Then he said, "Until half of the night had passed." Shu'ba said, "I met him one time and he said, 'Or a third of the night.'"