I did this as a all day hike, great experience but very strenuous and I loved it!!! Great Trail along the river, very muddy, I did the hike and came back to parking lot via the south trail and cut across the river. 13-14hr hike and my recording said 18 miles I believe, I started at 4am and summited Marcy around 11-11:30pm. Great Views. No water on trail but I did see signs for bathrooms.