I have heard mixed things about how long to sparge. I have read that if you are batch sparging (what I do) you can just run it off with a fully open valve. However, I have also heard from reputable people that like with fly sparging it is important to sparge slowly with batch sparging. Any opinions? I don't wanna waste 60 minutes sparging a batch sparge if it isn't necessary but I DO want to spend the 60 minutes doing it if it is important to efficiency because right now my efficiency sucks.