Agree 60 windshield hours is optimistic between summer rv traffic and the roads on the alcan on up.
8 days is pretty easily doable imo. My trip up from Seattle said 42 hours and I was around 50 hours, driving by myself with minimal rest stops and meal stops.
Advice is, make as much time as you can the first 1500 miles or so until the roads start getting nasty. After that you'll get to slow down and see the sights.....and the orange cones every 200 yards!
Sounds like an awesome trip. Will you be able to stay a while in the fall after your gig and tour more of the state?