I extract brew. After I boil the three gallons of water, I take the kettle off the stove and pour the sugars in, and stir under I'm convinced it has all been dissolved. Placing the kettle back on the stove, I wait until it boils again before I pour in the bittering hops. At this point I do stir a lot, perhaps 3-5 minutes, to make sure that no "solid" part of the hops (I get pellets) would get stuck to the bottom of the kettle.
I do not stir at any time from here to the next hop schedule, where I repeat the 3-5 minute stirring.
Should I be stirring every N minutes, or does it not matter?
Does it matter whether it is extract vs full grain?