New Pro Labs Subscription

I’m actually planning to pass all the pro labs on 2022, I decided to pay a yearly subscription but yesterday I discovered that there is a (One-off fee) and subscription for each lab, so my question is how many time do I need to pay these fees ?

The One-off fee is paid in addition to the months cost on starting a new subscription. After that each month the subscription cost is due. If you cancel and restart a subscription or subscribe to a different prolab another One-off fee is required.