I guess I'm more with the OP on this one. In May we drove about 600 miles from home to Bluff, UT to see Monument Valley and a couple of national monuments in the area. Spent two days there and drove back, roughly 12 hours drive time with stops for food and gas, etc.
Last week we drove about 8 hours each way from home to ND to visit Theodore Roosevelt NP. We drove up on Wednesday in 100º+ temps and the dash A/C quit blowing cold about 100 miles short of our destination, so we drove the rest of the way with the gen and rooftop A/C running. We had planned on two days there but cut it short and drove back on Friday. And the dash A/C was working fine again, no idea what happened to it or why it stopped when it was 103 outside, but it really sucked lol.
We're also planning a trip up to Glacier NP next month, but since we don't want to try to make it in one day we're breaking it up into two 6 hour days there and two back, with a detour through Yellowstone. I'd like to limit distance to around 400-450 miles a day on all our trips, but when the destination is 500-600 miles total it doesn't make sense to me to break it up if we don't need to. We're retired but still have time constraints that make longer trips difficult for now.