Your access window varies based on the Pass you buy...and is determined by the producer of the event or training.
If the Pass you bought is offered LIVE, then your access window starts the day the Live event occurs.
If your training is offered only On-demand, then your access window begins immediately. Your Pass will activate when you login.
How long is left?
On your Dashboard on each Pass image that you have, you will notice a clock symbol and a number of "more days" (see red arrows below).