[acadien]

You don't have to respond to a text immediately, you don't have answer a phone call. Students can contact you all they want and you can simply ignore them when necessary.

Many students work part or full time jobs. Some of them have kids of their own so stagnant office hours will prevent many of them from contacting their instructors at all. Why not make use of the modern tools everyone else is using to communicate? Why lock yourself away in an office that no one will find?