My thinking is that we will not be in the mood to stop at places on the way back. I was thinking that we could leave early Thursday morning. We'd have approximately 9-10 hours of driving to Gillette (from Granite), not including pee/eating/sightseeing stops. We'd need to add on at least a few hours for those. We could get to either Gillette or Buffalo, I don't really care. Buffalo is about another hour(?) past Gillette.