This is a Premier Route. To claim an FKT on this route, you must meet a high standard of documentation and verification. See details here: https://fastestknowntime.com/premier-routes.

Nathan Flear posted the route:

The Welsh Three Peaks Challenge takes in the three peaks of Wales: Snowdon (Yr Wyddfa) in the North, Cadair Idris in mid-Wales, and Pen y Fan in the South.

The "Stubaier Höhenweg" is a high-alpine Route that goes through the Stubai Alps in Tirol near Innsbruck, close to the Italian Border. It's a mix of high alpine trail, some scrambling parts and a few minor glacier crossings. We expect to cross some old snow fields on the north sides as well. The route seems to be about 78 km with 6000m of elevation gain and about the same in loss. Usually its done backpacking style from hut to hut in between 5 and 8 days by hikers. There are 7 huts from the Austrian Alpine Club along the way.