It's possible to have charging stops that are barely more inconvenient than fill ups.
"Much less than hours" is still a long way from "barely more inconvenient than fill ups." Even with superchargers, you're looking at multiple stops during a day's drive that are longer than any stop I make when on a road trip. Under harsh but realistic conditions, you could be looking at a 40-minute supercharge every 2 to 2 1/2 hours; that's downright bad.
To get to "barely more inconvenient than fill ups" I think that you either need battery swaps or you need charges that are (1) almost twice as fast as a supercharger, (2) placed better in certain cases*, (3) need to have a guaranteed low or no wait, and (4) need better coverage**.
* In particular, on toll roads they "need "to be accessible without exiting, which they are not, at least looking at my usual trip from WI to PA/NY.
** Even on Tesla's "end of 2015" planned locations on their website, there is no charging station along I-86 in southern NY. Stations in the plains states are widely-spaced. There's essentially no coverage away from interstates.