You'll have to plan your gas stops carefully. Some towns close up at 5 PM. You will be adding 15 hours of driving time to your trip taking the back roads and staying off of the highways and turnpikes. It's going to take you about 55 hours driving time to get there. That's about 10 days worth of riding unless you really push it and have a real comfortable seat.
Just remember to get off you bike for a few minutes if you feel tired or fatigued.
I've driven from MA to AZ quite a few times but always used the highway so I can't help with the backroad routes. I always wanted to make sure there was a gas station available and they are on the highways.