That's certainly a way of working, and if that's what you've agreed too then certainly you should be as available as possible. There are more asynchronous ways

That's certainly a way of working, and if that's what you've agreed too then certainly you should be as available as possible. There are more asynchronous ways to do things, and not always restricted to contractor-style arrangements. Personally, I think it's unfortunate if the default way of working assumes such tight coupling: for me at least, it's inimical to achieving any kind of deep focus.