Typically a total of about 50 minutes, we do this trip pretty regularly. Well, before COVID... We change up where we charge usually depending on wether I, or the dog have to pee.
Between here and LA there are probably a half a dozen superchargers. The car figures out where to charge when you select a destination. We also know how many chargers are available before we get there, which is updated real time. The car also pre-chills the battery for faster charging on approach.
Another misconception some people have is that you rarely ever charge to 100%, charge rates taper as you get closer to 100% but charge reduclously fast from 20% to 80%, which is why it’s often best to stop for short breaks of like 15 minutes every 250 miles or so. At least with the 3, which has 325 mile range. The new S is rated at 400.
A couple Christmas ago, we did have issues with waiting for a charger. It was Christmas Eve and we were on our way to LA. The model 3 had just come out the previous spring and Superchargers were packed. Since then more locations have been added and most of the locations have been expanded, some with more than 20 chargers. The cars charge faster now too, due to an OTA update.