Seven Lakes Trail is a one trailhead backcountry hiking trail, so you're looking at an in and out backcountry trek. The total elevation difference for this backcountry hiking trail is 2,741 feet which is a higher than average number. Different parts of Seven Lakes Trail are at very different elevations, so keep in mind that you may need to dress differently at different elevations. You should count on this hike taking about 7.5 hours, but of course some folks walk a bit slower and some a bit faster. This area does get very dry sometimes, so do check for current fire restrictions before you go if you plan to bring a stove or make a camp fire. This is a long hiking and backpacking trail, so don't forget to pack enough supplies. Being 8.4 miles long it's an average length backpacking trail.