This is a one trailhead wilderness hiking trail, so you'll be backcountry trekking it in and back out. This backcountry trek shouldn't take more than 7.5 hours, but you never know stuff could go wrong and you could get stuck so be prepared for that. The total elevation difference for Twin Lakes Trail is 888 feet which is a lower than average number. Sometimes this backcountry trail gets really dry, so do check for current fire restrictions before you go if you plan to bring a stove or make a camp fire. The backpacking trail stays roughly within the same elevation zone the whole time which means the conditions are about the same from start to finish. With its 8.4 miles of walking distance it's a mid length backcountry walk. Now this backcountry trail is pretty long, so do pack enough food to last the whole trip.