Just having this chat with my mum. Last year my dad was in hospital for nearly 2 weeks, and wanted my mum there at 2pm as visiting started, right up until they kicked her out at 9pm. He had an op a few months later, and exactly the same routine. I was driving her to and from the hospital, and at pickup I'd arrive and he'd be staring into space or watching the general goings-on in the ward; she'd be reading the paper or half asleep in the chair.
I can't imagine anything worse than having a visitor stuck by the bed for 7 hours a day, no real conversation, no privacy anyway. If you've got a visitor you can't read a book or play with your phone or watch tv, you have to 'interact'. I'd be happy for someone to pop in, stay half an hour, then bugger off and leave me to do what I want - even if that is just lying there feeling sorry for myself.