"How far do you expect to walk in a day?" No it's not a stupid question. I recent checked a route where the longest back packing trip an entrant had experience of was a Bronze DofE expedition. The experience sheet submitted with their entry revealed that they were expecting to walk up to 20K a day. The route submitted later included several 30K plus days over trackless terrain and one day of over 40K. This told me something about the entrants ability to read a map and plan a feasible route. And after 50 years of walking in the hills I still use Naismith's rule (adapted to my abilities) as a rough & ready guide when planning my routes, maybe not for everyone but it suits me.