I took the family on vacation to Texas a couple weeks ago. Flew into Houston, stayed there a few nights, then Austin for a few, then Dallas, for a couple then back to Houston for a few more and flew back.
Just mapping out the loop between the three cities is 9.5 hours and 623 miles. Add in slowdowns for poor visibility due to weather, stops to charge and use the restroom (with small kids), it was easily 12 hours, at least, of total road time.
The driving part wasn't much fun but wasn't that bad either. We'd get the kids good and tired doing fun stuff on City A before driving to City B. Then they had their tablets/switches (and headphones), wife had her audiobooks on headphones, and I'm rocking out with the stereo.
Come to think of it, they put their headphones on after I started rocking out...
Got to see a whole bunch of stuff. Space Museum, Houston Zoo, exploring Downtown Austin, saw the eclipse at the Perot Museum, Houston Museum of Natural Science...plus countless breweries and unique local eateries and shops.
We rented an EV (Mustang Mach-E). Didn't pay for flight, hotels, or car (all points).