Mishkat al-Masabih 1590

Anas reported God's messenger as saying, “A visit should last as long as the time between the two milkings of a she-camel.”(The reference is to the practice of drawing some milk from the camel, then leaving her for a little for her young to suck milk. When she then let her milk flow copiously she was milked again.) In the version of Sa'id b. al-Musayyib in mursal form it says, “The best type of sick visit is when one gets up and departs soon.”(While this is more explicit to one who is not familiar with the milking of camels, the meaning is the same as in the form given by Anas.) Baihaqi transmitted it in Shu'ab al-iman.