When purchasing an online training, the access to the content does not expire.
Feel free to watch and re-watch the videos as many times as you like.
The online courses are self paced so there aren't any deadlines that need to be met nor are their assignments that need to be submitted.
There is an Assessment of Knowledge that needs to be submitted at the end of course in order to prove understanding of the concepts in the training and receive a Certificate of Completion.
80% or higher is considered passing and this assessment can be taken as many times as needed to pass.