Every single day of your life that you use the oven, as opposed to eating something fresh or cooked stove-top. And strictly, just for those things cooked in the oven that the oven-improvement improves.

The oven improvements being discussed here will have the effect of making more things best done in the oven.

Yes, certainly that metric should be "the amount you use your new oven", not "the amount you use your current oven".