We used to cornmeal lightly but then discovered parchment paper. It's super easy to slide off with a spatula underneath. When you par-bake, how long does it ta

We used to cornmeal lightly but then discovered parchment paper. It's super easy to slide off with a spatula underneath. When you par-bake, how long does it take you to then add the ingredients? Do you have to rush? Or is it better to take a few minutes, so the oven can re-heat itself?