Like others have said, that last day will be a long to take out, (its always long), but it should be doable. Get on the river really early to one avoid the heat & the wind, & the light in the morning makes seeing where the sand bars a little bit easier. There are a couple nice camps below Slickhorn which can make the last day not quite as long, even when the water is up, Slickhorn to Clay Hills is a long, flat, currentless float. Grand Gulch is beautiful & if not too hot, makes for a spectacular side hike, Steer Gulch is really nice too, & has good shade, although if its buggy, Steer can be REALLY buggy. Ojeto is beautiful too, and further down, but I think you need to get a permit from the Navaho Nation to camp there since River left is on their land. Even though the river is all flat below Slickhorn, from there to takeout is my favorite part of the canyon because its so beautiful, the canyon walls are tall and the color of the rock particularly incredible. Have fun! Bring shade & lots of sunscreen, & maybe a sarong/sheet to get wet & wrap up in if its hot for sleeping at night.