When you bake a frozen pie the frozen pie takes between 30 to 50 minutes to bake.
It depends on the type of pie you're baking but figure on 3 to 50 minutes of baking time to cook the pie in the oven fully when it's frozen.
A thawed out pie usually cooks within 20 to 30 minutes but the frozen pies take a bit longer to cook.
When baking a pie that is frozen you need to preheat the oven to 375 F and then place the frozen pie on the middle rack of the oven.
Then set a timer for 30 minutes and after 30 minutes check the pie by inserting a fork or knife in the middle of the pie and if the fork or knife comes out clean then the pie is fully baked.
If the fork or knife does not come out of the middle of the pie clean then it needs to bake for 10 to 15 minutes more.