BRF, It is about 1 mile from the trailhead downstream to the beginning of the Big Shoe. Most of that follows right by the trail with one small bend around a little ridge at about the 1/2 way point. So, time depends on your personal pace.
I have fished either the Big Shoe or the Little Shoe every spring for the past several year. And while I truly love the "experience" the fishing has been less than spectacular the last couple of years. Actually my first year '04 was maybe my best year and I had just started fly fishing.