I recently swapped a Hopper 2000 for a HWS and my OTA channels are not listed in the Dish Anywhere app?
The max amount of time it should take is about 10 minutes regardless of what you are doing, as long as you are IP connected. There is no reason it should take 24 hours. I would try refreshing the guide on DA.com, try refreshing your browser, log in and out, try another browser, clear browser history cache etc.