Ibn al-Mubarak (may Allah have mercy on him) said that al-Awza'i (may Allah have mercy on him) narrated the same hadith, except that he said: "Do not exceed it," and he added at the end that Abdullah bin Amr (may Allah be pleased with them both) used to say after he had grown old: "Would that I had accepted the concession of the Messenger of Allah (peace and blessings be upon him)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8475