This hiking and backpacking trail has only one trailhead, so in and out is the way to backcountry trek it normally. The total elevation difference for Hilina Pali Trail is 1,823 feet, and that is about average. Hilina Pali Trail is quite long, so make sure you bring plenty of supplies. Different parts of Hilina Pali Trail are at very different elevations, so keep in mind that you may need to dress differently at different elevations. Hilina Pali Trail is 10.6 miles long; it's longer than many backcountry hiking trails. This backcountry walk shouldn't take more than 9 hours, but of course some people walk a bit slower and some a bit faster.