Interchanging two faces

Hello all,

Just a question for fun. Suppose you have a Rubiks cube and you want to interchange two faces? How many stickers need to be moved?

Distinguish between opposite and adjacent faces and between using a screwdriver (for disassembling) or not, so you get four answers.

Next, do not read any further before adding those four answers to obtain a single answer.

If the answer you get is larger than or equal to this, then your answer is wrong. If your answer is less, then you will probably already know that your answer is correct.