A 600 mile trip can (theoretically) be done with 1 charge, because you leave home with full range, and arrive with 0 charge (and fill up overnight). That one charge is done while eating dinner,
or spaced out in increments over the course of the trip, stops which you would take anyway. I know few people who want to bang out 10 hours without stopping for at least 1-2 hours over the course of the trip. And those who do, can be the edge case with gas cars.
So you need to go 600 miles, and you need 1 full charge worth of energy during that.
If that one charge takes 1 hour, you can also break it up into four 15 minute sessions at any time of your chosing.
I'm sorry, but almost no regular person does 10 hours without at least four 15 minute stops.
Range is not at all the problem people make it out to be.