OP, is he going to Cambridge?
If so, I spent four months in there last year for the same reason.
Regardless of which hospital, what I’ll say is this:
Take the time to get to know other patients, I don’t know the setup at other hospitals but they often have facilities for this.
Exercise as much as possible. The physio’s call it prehab. The fitter you are pre transplant, the easier the recovery will be post transplant, assuming there are no complications.
It’s not possible to put a time on it. They say six months, and that will have been calculated based on stats and his matching criteria etc, but the truth is that once he’s on the active list a heart could come up at any time. And when it does, it’s not guaranteed that the surgery will go ahead.
But I know people who were in for six weeks before going down, having been prepared for a lengthy stay, and others who were there for months having been told they should get a heart soon.
I personally had two false alarms before my actual surgery, another friend had three, and another had six.
If it’s Cambridge I can hopefully offer much more support, but either way I’m happy to answer any questions. I’m almost 8 months post transplant now, am back at work full-time and have had very few post op complications.