Tip - make the whole batch into waffles when the batter is fresh as if not, they will not rise as well. You can re-heat leftover, cooled cooked waffles after refrigerating or freezing and defrosting. They take around a minute to re-heat in the pre-heated waffle iron.
Note - timing and quantity of mixture per waffle are based on the typical measurements in my waffle iron's guide. If yours is different, adjust accordingly.