Hello again, Sherrie:
Let me join the other posters who are extending their concern and offering prayers for Don's recovery as well as strength for you. Glad that you're getting a break from well-meaning family for a bit. It should help.
During my hospital stay last summer (when I had my AN surgery), I spent 3 days in the ICU. My wife stayed with me a good deal of the time I was in ICU. She slept in the nurses lounge on a cot the nurses graciously set up for her. Initially, she was told she couldn't stay with me that long but she challenged the nursing staff by stating that she had been by my side for 36 years and was not going to leave me, now. As I was doing well (no complications) my neurosurgeon, who was well-liked and highly respected at that hospital, told the nursing administrator that he had no problem with my wife sitting by my bedside and talking to me when I was awake. She stayed.
Physical therapy can be very beneficial in AN surgical recuperation but I'm afraid there is no definite time-frame as each patient has different areas that need 'work' and we all respond differently, too. The hospital therapist can give you more complete and specific information once Don has been evaluated. He will have to work hard but it pays off.
As for radiation treatment, I'm surprised your doctor didn't mention FSR (fractionated stereotactic radiosurgery). FSR is becoming more common as a post-surgical treatment to remove any remaining tumor while avoiding facial, motor and sensory nerves. My neurosurgeon went this route with my large AN (4.5 cm) and it was very successful. He hollowed out ('de-bulked' in medical jargon) the tumor (down to about 2.5 cm) and last fall, I underwent 26 brief sessions of low-dose radiation. A December MRI showed some signs of necrosis (tumor cell death). I can't wait for my next MRI in April! For Don's sake, I would try to look into FSR before committing to any of the other, high-dose radiation treatments you mentioned. Consult with a radiation oncologist. He'll have the specifics.
Meanwhile, try to get as much rest as you feasibly can - and stay positive. You and Don will get through this. We all do.
Jim