What would the cost be for a home care aid to come for about 4 hours a week?

care for brother in law -My sister is sole caretaker of her husband - she wants to keep him home with her. She had medical problems herself and needs to go for therphy 2 times a week and has no one to stay with him. She would like someone - preferable a male-
to stay in her home while she goes for her treatments- - what would the costs be for this service? Approximately 4 hrs a week.