Since this recipe calls for zucchini to be cut into coin-sized small pieces, it is enough to bake for 5 minutes. You may cut zucchini into long spear shapes or slice them into half or quarters. For longer cuts, the baking time would be longer, like 7 - 9 minutes. For longer cuts, I would prefer to check it once after 6 minutes and every couple of minutes so that it doesn’t overcook.