If you are planning to eat your pie today you can go ahead and keep it out of the fridge in a cool, dry place.
If you are going to eat it tomorrow or a few days from now, just put it in the fridge. Fruit pies will last about a week in the refrigerator and custard based pies will last 4-5 Days.
When it’s time to serve your pie we recommend heating it up in the oven. Pre heat your over to 300º and warm the pie for 5-10 minutes.