Later this month, wife and I want to do the approach trail up to Springer and back down to The Hike Inn. We have to be at the Hike Inn by 5pm. We are both 62,but we have done two section hikes of a week each and have made it from Springer to Fontana. Last day on trail we made it from Locas Grove to Fontana approx. 18 miles, but took 11 hours. How hard is the Approach?