Last year I did a Seattle to
Last year I did a Seattle to LA road trip, 1187 miles/1910 km each way. 21 hours and 31 minutes total elapsed time down; 21 hours and 15 minutes total elapsed time back up. Eight stops to charge each way; each stop was a bathroom/stretch-your-legs break and three were also meal breaks. If we extrapolate your pace to my distance, you'd do it in 20 hours and 12 minutes. Since that road trip, Tesla has improved Supercharger speeds that would easily trim 16% of my charging time on the same chargers and are adding newer higher speed chargers that will trim it even further. CAN you do it faster by doing it in "Cannonball" fashion? Absolutely. But even with the older charging rate I experienced on my road trip, you only save about an hour based on how you ACTUALLY drive a road trip (I'm assuming this one is representative of a typical road trip for you). Now balance that out with the rest of the time. It takes me 15 seconds to plug in and 15 seconds to unplug for my "fueling" at home a couple times a week. You save a little time on a road trip (and admittedly COULD save more); I save time (and money) the rest of the time. Road tripping in an EV (at least a Tesla) is just not that difficult and certainly doesn't overshadow all the benefits it has over most ICE cars.
For your relatives 8 hours away: Likely 3 stops each for less than 20 minutes (use the restroom, stretch your legs, find some food or eat what you brought). Now you're at 9 hours... maybe.