That's hard to say, depends on how much is in the pool. It's kinda like the FC slam levels. At first you'll seem to be doing it a lot, but as it clears you'll be doing it less and less. That's why they say to do it at 20% above normal as it clears out the bad stuff and allows your pump and filter not to have to work as hard. If you look around the site, you will see it mentioned about adding some DE to the filter to help catch the smaller stuff quicker, but I have no experience with that so I leave that one to the pros. By the way........they are watching our conversations
I am going to buy some DE while I am out at the store. Anything to make it a little quicker is a good investment right now!