Driving long distance when there's nothing around (eg the M6 between Preston and Glasgow) is so much simpler. You can definitely drive longer when you're not constantly negotiating city-adjacent traffic.
> Size of the country has no impact on this - people become tired and distracted during long drives.
But size of the country (and more importantly, density) has a massive impact on how far people drive and how frequently.
You can have multiple drivers sharing the same vehicle. This is a common occurrence in both commercial and non-commercial situations (e.g. a family trip with two adults alternating driving and rest periods). With 3-4 drivers on hand, either traveling with the vehicle or trading off along the way, a vehicle can be operated continually without any safety concerns, making the EV with its limited endurance and long recharge times the weakest link.
At least here in Europe there are laws (for commercial drivers) about how long you are allowed to drive for, and when you must take breaks, e.g.:
> "you must not drive more than: 9 hours in a day - this can be extended to 10 hours twice a week"
> "a break or breaks totalling at least 45 minutes after no more than 4 hours 30 minutes driving"
Perhaps the US has zero laws in this regard, but these sort of rules exist due to lots of lessons learned by tired drivers killing people. Sure these are for commercial drivers, but I'd argue that if you are doing this sort of long-distance driving frequently (i.e. not just once or twice a year) then you are no different from a commercial driver and shouldn't assume these common sense laws don't apply.