You have 45 calendar days to complete any certification program. While the training is designed to be done on your own, you will be able to discuss specific questions with your faculty advisor during your training.
A one-time courtesy extension of 15 days is available if needed. After that, you can extend your training time for €50 per 30 days so that you can finish the program (including tests and any essays). For your future reference, your access to the training content does not expire.