I think we have some Nissan owners here who have close to 200K miles on their Nissans with CVT. I know back when I frequented a few busy Subaru boards, there's many folks there with close to the 200K mile mark. Probably beyond that now.
In regards to them holding up in higher HP and heavy vehicle weight applications, we shall see. My 2016 Nissan Quest minivan with the QV35DE V6 and CVT has a curb weight of ~4400lbs, max payload of ~1500lbs and supposedly has a tow rating of 3500lbs. Ours routinely has 5-7 people in it and has made it to 65K miles flawlessly. I did pay for an extended warranty that covers me another 3.5yrs, up to 110K miles.
My point is, Nissan uses CVTs in some large, heavy vehicles, including their smaller commercial cargo van. That QV35DE and CVT combo is used in a bunch of their stuff. What I like most about it is the ease at which you can level check and drain/fill the CVT on these.