There's lots to do while charging at many J1772 locations - unlike the supercharger locations where I've heard it's very, very boring.
Well, there may not be a "lot to do" at some of the Supercharger locations, but you are probably only there 30 to 40 minutes max. and you will have added about 140 to 170 miles of range charge (YMMV).
If you want to fully charge, you can do that too, but not really required if there is another supercharger on your way.
If another car is already charging on the same Supercharger circuit (i.e. 1A and you are at 2A), your car will charge at a slower rate.
Most of the Superchargers are conveniently located adjacent to a food service or restroom facility or some sort of shopping.
Plug-in your car, go grab a bite, take a bio break, come back, unplug and continue your travels.
My suggestion would be for you to visit an actual Supercharger location, and see how quick the charging actually is.
And also to witness what kind of adjacent Options there are to occupy that 30 to 40 minutes of charging time.
Heck, the San Diego/Sorrento Valley Supercharger just went LIVE...
...so maybe today is the day.
Charging @ a J1772 location takes a relatively long time, even to get 100 miles of range charge.
Probably about 17 to 19 of range miles per hour.
14-50 NEMA plug (@ home or at an RV Park) will get you about 28 miles of range per hour.
A HPWC charger will charge at about the same rate, unless your car has dual chargers, then it is faster, about 56 miles per hour.
One of the beauty of Superchargers is you don't have to completely "fill up" during your stop, because you are on your way to another Supercharger.
Get enough charge for the anticipated distance plus a bit of a buffer.
There are actually TWO Getty Museums:
**The Getty Center in Brentwood ($15 parking, $10 after 5 pm), closed Mondays, ride the tram up the hill, Admission is Free, Summer Season open Fridays until 9 pm.
and
**The Getty Villa @ Pacific Palisades off the Pacific Coast Highway ($15 parking, $10 after 5 pm), closed Tuesdays, advanced (free) time-entry tickets are required, Admission is free, Summer Season open Saturdays until 9 pm.
And both are worth visiting.