400 miles wouldn't even get me to my brother's place in the next state over.

More than 400 miles in a day is common in US roadtripping. On the other hand, breaking up those long driving days with a reasonable recharging period would be more than OK.

I think for many Europeans it's easy to forget just how big USA and Canada are. I've been on vacation (we just call it holiday) where we've driven SF -> Yosemite -> Las Vegas -> Arizona -> LA, and on another trip DC -> Virginia -> Charleston -> Savannah -> DC, and both times I've forgotten just how long it takes to get anywhere. I suspect this is why so many people fly domestic?

Every summer I drive my family home 928 miles in a single day from our vacation house in Florida.

Sure, but you probably take a 45 minute break somewhere in there to "recharge" your body, so recharging your car isn't that big a deal.