I purchased my used Model X in Raligh, NC and drove it to Prescott, Az, about 2300 miles. I think I stopped either 12 or 13 times to charge and spent 3 nights in motels. The farthest I went, I have 325 range, but that is from 100% full to zero charge and nobody should or would run that way, was 210 miles. The system would show me where to stop and for how long to get to the next charger system. Most stops were for 15 to 20 minutes, some 35-45 minutes and two for sure were 50 minutes. All depending on the range I needed, based on my speed or always running the speed limit and a touch over. In some areas the mountains played a big part in using more energy for a shorter drive range. What I have found interesting is in almost every stop, folks would get out and talk about the or their cars to other folks charging up. When was the last time you got gas and walked over to talk to the folks getting gas in a pump near you? Uness they are in a clooector car or hot rod, you just pump your gas and leave. I LOVE driving the Avanti with the top down around town, but for excitment, the X wins hands down.
Look on the route you would drive from home to Maine and see if the super chargers Tesla has are on that route. Looks like about 6 chargers I see on the map but your route may not??