Whew, I don't know anything about the terrain or those guys' fitness (though I'm sure they're in awesome shape) but 60 miles per day does sound extreme, close to impossible.

If you look at Bravo Two Zero, the SAS patrol at one point completed about two consecutive marathon runs in 24 hours while Ryan covered 190 miles in 8 days altogether. Granted, it was under combat conditions but the sheer exertion nearly cost him his life and left him partly crippled for life.

Anyway, I'm not sure 60 miles in a single day is feasible even for the best trained guys, let alone as an average for several consecutive days. Maybe the TV editor just made a mistake somewhere?