For my long runs I have been running from home to Calvert Cliffs, then running multiple loops around various different trails. Since the parks mileage signs are not accurate I have no way to know exactly how many miles I cover in there, so I'm kind of estimating based on the time. As I understand most people slow down on trails, ok so my question is: Are there any broad or rough guidelines as to how I could calculate to ensure I am covering the distance? For example if I have an 18 miler up, and I know from past runs on the road of 18ish miles that it takes me xx:xx time to cover, should I add time to the trail run? If so about how much time should you add? Sorry this is so long and I hope it's not too confusing. (fyi: I have almost always measured distances with the car for previous long runs so I could be pretty certain I was covering the required distance.) Any advice is appreciated, Thanks!
