Not long. My most common road trip is about 720 km one way and doesn't have a lot of destination charging. I stop 3 times on the way up:

* 5 minutes to get synced up with the distance between chargers (it's a very rural route; on more major routes you have plenty of choice about where to stop)

* 20 minutes

* 15 minutes to make sure I can make it back to the charging network since my destination is super rural.

I have made that same journey to visit family many times in a gas car and we stop in the exact same places for pretty much exactly the same amount of time. The first one is in the town my grandmother lives in, so we'd have stopped to say hello anyway. The 2nd is where we have always stop for a meal. The 3rd stop is where we always take a bathroom break.

https://abetterrouteplanner.com

Select a car and enter a route. It will be a pretty accurate picture of the necessary charging. You can play with things like temperature, arrival and departure charge state, and load.