This is a one trailhead backcountry trail, so in and out is the way to backcountry hike it normally. There's not much difference in elevation along the hiking trail which means the conditions are about the same from start to finish. This backcountry trek should take you about 2 days, so make sure you've got all your overnight gear packed. Being 12.4 miles long; it's a long hiking trail. Keep in mind that this is a long backcountry hiking trail, so do pack enough food to last the whole trip. Waimanu Trail has a total elevation difference of 1,374 feet which is about average.