My boat has been in a slip since the beginning of May. Had to pull the boat last week because of an engine problem. Both the transom bracket and skeg/trim tab anodes were new in May. I would say they are 50% used up. I have replaced them. My question, is Whittier harbor that hot? The boat is aluminum and I am NOT hooked to shore power. Just seems like I should have gotten a little more time out of the Anodes. I do keep a battery in the on position as it sits in the slip, and everything is turned off except auto bilge pump. I have a round disc type anode attached to the boat itself and it is in good shape.