I ran this loop yesterday. I started at the North Inlet trailhead, ran up the North Inlet to the junction with Flattop. I tagged Flattop. Then down the Tonahutu trail and back to the car at North Inlet. It took me 5 hours and 37 minutes. You can go faster if you don't take photos and enjoy the views . I ran solo, carrying a UD blaze hip belt and two water bottles. Fun loop!