I'm pretty sure that if electrics had double the range as gas cars, people would not complain about charge times (500-600 being reasonable for a modern midsized car last I checked). As it is they are instead half that distance.
When I drove home from Nashville in a car with a 350 mile range, a one hour fill time would have turned a long day travel into a two day trip (2 or 3 fill-ups over 11 hours), I was young, and aside from gas stopped once for food at a rest stop, the electric, assuming optimal location of chargers, would have added 20% to my travel time. 1000 miles on the other hand changes everything.
Also, the 300 mile range is at 55MPH, at 70 (legal or 5 over on much of the long haul drives) you're down to 240 (my 350 was at 70MPH).
Using the non topped off charge technique at a super charger gets you 170 per 30 minutes charge, take out the 20% for actual highway speeds and you're at 140 for 30 minutes charge, that 30 minutes for every two hours driving, a far cry from 8 hours for 16 hours.
Keep in mind that a standard wall outlet take 60 hours to charge current capacity, a 240 40A one takes 9. A standard charge station, so we're still a ways away from charging double the capacity in the 8 hours when traveling, but certainly 8 hours for 1000 miles would work.