Get your distance up.
You need to know how well your muscles, be bones, ligaments and especially tendons will cope with the milage. Muscles are pretty adaptable; they’ll complain and then ache for a few days but they’ll be ok. It’s the tendons; Achilles, hamstrings, patella tendons you need to worry about.
Also by increasing your distance you find out where your weeknesses are. I, for example have just discovered that after 40km my buttocks have rubbed together and caused chafing…..
But at least I can deal with this next time.
Check out my hike on Strava: https://www.strava.com/activities/1750140374/shareable_images/map_based?hl=en-US&v=1533424634