I've climbed Top Notch several times using the routes mentioned in the text. The first time was in 1976 when I was working at Yellowstone Lake Hotel; the most recent was August 20, 2012. I've continued down the fabulous ridge to Mt. Langford once. I think it took about 6 hours round-trip from the top of Top Notch.
Because Top Notch is such an overlooked gem among Yellowstone hikes, I created this page to replace an earlier one that was deleted from SP. I'm indebted to the folks who posted photos on that earlier page, which I've reused.