The Prophet (peace and blessings be upon him) would go round to his wives within a single hour of the night or day, and they were eleven. Qatadah (may Allah have mercy on him) said: I said to Sayyiduna Anas (may Allah be pleased with him): Was he (peace and blessings be upon him) able to do that? He said: We used to say among ourselves that he (peace and blessings be upon him) had been given the strength of thirty men.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13351