Something I don't get. What does it mean "you need to be there for the whole duration"? Is it some kind of house arrest? I've rented places where I was absent t

Something I don't get. What does it mean "you need to be there for the whole duration"? Is it some kind of house arrest? I've rented places where I was absent the whole day except a few hours at night. How would anyone know I was or wasn't there at all? It's not the business of the host anyway to tell me where I should be present. I paid money, I rent the place, where I am physically present is not their fricking business.