Yup, since like 2004 the average is an about 80 minutes set, but a few times they did also slightly over 100 minutes, mostly due to songs like Little Things and BIO extended. The tour schedule is not very tight, they only play 2 nights in a row four times, enough time for the band to rest after a maybe longer performance. After most of the shows they have a day off after.
If you look at 2008, they had 2 or 3 nights in a row very often. Or for example Milton Keynes was the third night in a row.
So they could easily do a lot more than 80 minutes, with a bit more talking here and there and 1 or 2 songs more.
We will know in a few days how it's gonna be.
I think the setlist(s) will be good. Every time they came to Europe in the last two years, they destroyed the previous performances. That's why I see something new this summer.