I think this tour is around 15km long depending on your route. Some stops are hard to see on the map, but if you use google maps you should be fine. The tour is definitely not for elderly, children or disabled people as it goes up and downhill. You do see everything Luxembourg has to offer. However, if you’re not interested in museums this is nog for you as it passes all of them. The storyteller is obsessed with heels which is quite annoying. If you did the tour you’ll know what I mean!