There is a 2006 R18 Civic that made it to 1 million miles, though it wasn't on the original engine, but the engine was replaced (at something like 375k) only because the owner had a low mileage spare engine laying around that he scored for cheap off of eBay. He said the original engine was still running great and he kept it. That second engine got the car from 375k to about 1.1 million before possibly blowing a head gasket. The other million mile Hondas were F22 4th and 5th gen (90-97) Accords.
One of the reasons I chose my 2015 was because it was the last year for the original R18 from 2006. No turbos, no gas direct injection, etc. When researching, it seemed that the 9th gens had the absolute best reliability ratings.
Mine does have the CVT and I don't know what the fate of these Earth Dream CVTs will be, however, I have dug and dug the internet and I just can't find anything. R18 blocks cracking from 06-09, transmission problems in 7th gens, engine issues in 2016s, etc. all day long, but CVT failures in 2013+ Hondas? I just get crickets. I found ONE report of a CVT failure in a 2013 Accord. Most of the transmission issues reported were in regards to the autos in the V6s.
I also researched the CR-Z, Insight and the Civic Hybrid since 1998 which all had CVTs, and found some issues with the earlier ones in the 6th and 7th gen Civics, but still very little and the average mileage was about 180k. Nothing in the 8th gen Civic hybrids and only one that I remember for the CR-Z. But I believe the 2014 Civic uses a revised design, coined "Earth Dreams" generation of CVTs.
Quite a few 1st gen Insights (2000+?) with high mileage (500k+) on their original CVTs.
In any case I'm at 50k on the 2015 and I drive it 75-80+ on the highway 95% of the time at 40k a year, so we'll see.