Most of us rotate after every bag. I have multiple dogs and go through a bag of food pretty quickly, so I have two bags or even more open at once. Basically, you can do rotation how ever you want to. I don’t recommend going too long on the same food because it affects the probiotics in the gut.
I usually recommend printing up the 4 and 5 star lists and taking them to all the different places around where you can buy dog food. Make notes about what foods are where and for how much, then pick a few to try. Take notes on how they do on each food, and if they don’t do well on it then cross it off the list. When you have found a few different brands, a few different protein sources, and a few different starch sources, then you’ll have a good rotation.
