Everyone responds differently to their treatments. From what you have written it sounds like your father will be going thru treatments and recovery for several months. Usually its 6 weeks between surgery and rads. Then rads will be another 6 - 8 weeks and recovery a few more weeks. Start to when he begins to feel better could be anywhere from 4 - 6 or 7 months. This mainly depends on him which nobody here can predict. But this guess is pretty accurate.

Call the American Cancer Society and ask for volunteer drivers to help take him to radiation treatments. Even if you get someone to drive twice a week it takes a bug burden off your shoulders for those 2 days a week. Anyone who offers to help, write their name and contact info down in a book, have your parents do the same. Now is not the time to be proud and refuse anyones offer to help. Tell anyone who offers that when the time comes you will let them know what they can do but all help is appreciated. Even if its to pick up or drop off prescriptions, pick up some groceries or do a load of laundry, its a help.

Best wishes!!