But is it really?
A 2000 mile road trip with 20 minute charging breaks is gonna add what? 3 and a half hours on top of 30 hours of driving?
Unless you plan on doing a bunch of meth and speeding across the desert, I don't see a scenario where a regular person does 8+ hours of driving and doesn't take a 20 minute break.
I'd like to add that for the once in 20 years that car sees a 2000 mile road trip, I don't think waiting a little bit is actually an issue.
Take an honest reflection, and think, how often are people driving driving more than 300 miles in a single session.
Then think about yourself in the position of the road trip, are you going to sacrifice the lifespan of your battery to go from 20 minutes to 5 minutes charging time?, (especially since it's likely you will spend more than 5 minutes anyway just going to the bathroom, eating some food, etc.)