While it’s just a snapshot, there is a Facebook group of high mileage Tesla owners. I’m sure there may be some that have had to have battery replacements even if I haven’t seen the post, but I was surprised how many Model Ss there are around with well over 200k miles on the original battery. I didn’t know there were so many covering this many miles in Teslas. I know I saw one around 370k miles if I recall correctly so I would assume your experience with your Prius should be pretty normal which is nice.
Road tripping would make it hard to charge much past 80% anyway since it slows so much at that point. If I was obsessed with getting to 100% it would drive me crazy.