This great outdoors trail has a total elevation difference of 1,786 feet which is an average number. Halawa Trail has only one trailhead, so you're looking at an in and out walk. Now this hiking trail is pretty long, so do pack enough food to last the whole trip. You should count on this backcountry walk taking about 9 hours, but of course some folks walk a bit slower and some a bit faster. Some parts of this wilderness trail are much higher up than other parts of the wilderness trail, so keep in mind that you may need to dress differently at different elevations. Halawa Trail is 10 miles long; it's considered a longer walk.