Preparation_time_in_minutes function in Guido's Gorgeous Lasagna

Trying to learn python with Guido’s Gorgeous Lasagna. To Define the 'preparation_time_in_minutes() is confusing, is the function for total preparation time including baking or just the preparation time before baking ?

From the instructions:

[…] returns how many minutes you would spend making them.

>>> preparation_time_in_minutes(2)
4

Thanks, I did not read the instructions correctly earlier.
After reading the instructions, I found that the function preparation_time_in_minutes is taking number of layers as input and calculates total time of preparation by multiplying the number of layers with a constant(time taken by a single layer)

When in doubt, double check the instructions ;) They usually explain what you need to do.