Using the King Arthur popover recipe, I have not had any problem with my popovers settling at all for hours after baking. They hold their shape and crispness for at least 3-5 hours. But if you cannot fit at two pans in a single oven, and don't have double ovens, you're going to be challenged to come up with 18 popovers at the same time. So how will you keep the rest of your meal ready to serve? Bake some test batches to see how well your popovers hold up after baking. You may find that you can bake them first, set them aside, and rewarm them slightly just before serving if you can't bake them all to serve immediately and on time with the rest of your meal.

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