I've thought the same, but it's usually pretty easy. Just tell your boss you need to go to the doctor or dentist, and they'll usually let you off for a couple hours. What's difficult is barbers (where Trim-It might come in handy, or barber shops open until 7 or 8pm) and banks (which are increasingly moving to online-only but might still require a visit to wire money or set up a new account). These are more unusual services to ask work time off for.