In 2012 we day-hiked the western 45 mile section July 20, 21 & 22 from Jericho to Twelve Mile Road. The Donut Hole Trail passed through Kettle Creek State Park so we camped there and drove to our starting point each morning. In June of 2013, again with Asaph Trail Club friends, we backpacked three days the remaining 45 miles from Twelve Mile Road to the eastern terminus at Farrandsville, passing through Hyner Run State Park along the way. The entire trail is moderately difficult with many ups and downs. It travels from west to east (or vice versa), going against the normal north south alignment of the Allegheny Mountains, so there are a lot of mountains to climb and descend. (DCNR rates it as "moderate to strenuous"). If backpacking the entire 90 miles, allow at least six days. Seven or even eight days would be better. We did 18 miles one day and it was very taxing. There's plenty of water along the way and lots of places to stealth camp. Be prepared for a wet foot crossing of the Kettle Creek below the dam at the park. In high water there is a detour that adds a few extra miles.