GLC
Yep~ just did what you suggested.
Already committed to Flagstaff, in case quickie visit to Grand Canyon can be squeezed in :)
Dec 25th - Day # 2 weather permitting will reach Amarillo about 600 miles.
Dec 26th - Day # 3 hopefully reach Little Rock AK, just under 600 miles.
Dec 27th - Day # 4 reach Knoxville TN about 530 miles.
Dec 28th - Day # 5 home stretch just over 500 miles to Baltimore MD

Probably best to play it by ear, and stop when I think I have had enough driving for the day, factoring in the winter weather, get the gas tank full and find a motel close to the Interstate exit. My Garmin GPS is pretty good at locating motels using the points of interest feature.