JessM, I think you raise an interesting point, when my father was in hospital, which he was for the last 10 weeks of his life my sister and I would visit him daily and stay about an hour then go, but we often saw other people with members of their family sitting there, hour after hour, and I used to wonder whether it was as much a strain on the visitors as the visited.
You read on Gransnet as well as elsewhere of people measuring their devotion to somebody dear to them in terms of how long and how often they visited them in hospital or a care home and I have sometimes wondered whether it is really efficacious for either.
When the hospital rang us to tell us that my father's death was imminent my sister and I went straight to the hospital to spend his last hours with him, but when, after 5 hours, we took a short break for coffee and a sandwich, he had died by our return - and the hospital staff told us this was not uncommon.