How many hours did the Prophet sleep, and how many times did he bathe per week?

It is not possible to determine the exact number of hours the Prophet, peace and blessings be upon him, slept. As for his ritual bathing (ghusl), he would perform it as needed. He might perform ghusl multiple times in a single day, or he might suffice with one ghusl. He used to perform ghusl for Friday prayer, for janabah (ritual impurity requiring a full bath), after cupping, and after washing a deceased person.