You can make quiche ahead of time and store it in the refrigerator for up to 3-4 days. However, the crust may become a bit soggy over time, so it's best to store the filling and crust separately and assemble the quiche just before serving. To store a fully baked quiche, allow it to cool to room temperature, then cover it tightly with plastic wrap or aluminum foil and place it in the refrigerator. When you're ready to serve it, reheat the quiche in a 350°F (175°C) oven for 10-15 minutes, or until heated through. Alternatively, you can also freeze an unbaked quiche for up to 2-3 months. To do this, wrap the quiche tightly in plastic wrap or aluminum foil and place it in a freezer-safe container. When you're ready to bake the quiche, remove it from the freezer and allow it to thaw completely in the refrigerator before baking as directed. Keep in mind that the crust may become a bit soggy after freezing and thawing, so you may need to bake the quiche for a bit longer than usual to ensure that the crust is fully cooked.