This trail is somehow more serious (I hope) than what I’ve done so far. Again, it is an official Switzerland Mobility Trail and I started it in June 2018. It is not the Haute Route from Chamonix to Zermat but it is way longer (610 km or 379 miles). It is the longest fully marked trail in Switzerland.
I decided to take the official route as general direction only and hike more attractive paths in the vicinity instead, if there are alternates. At a later stage I may also experiment with GPS on this path.