The Prophet ﷺ would visit all of his wives in one night with a single bath.
حدثنا هشيم عن حميد
أن النبي ﷺ كان يطوف على جميع نسائه في ليلة بغسل واحد
Its chain of transmission is sahih. It is found in Muslim 1/249, no. 309, in the chapter on menstruation, on the permissibility of a person in a state of major ritual impurity sleeping. Also in Tirmidhi 1/259, no. 140, in the chapter on purification, on what has been said about a man going around to his wives, where he said, hasan sahih. And in Ibn Majah 1/194, no. 588, with the same wording.