All Access Passes (Subscriptions) include 8 hours of usage per day across all of your Cloud PCs over the last 24 hours. After you reach this limit, your Cloud PC will shut down. You can either wait a few hours and then play for another few hours or immediately keep using the same Cloud PC via Pay As You Go.
Sessions on Stim can be started in either Pay As You Go or Subscription (Access Pass) mode. As you switch between starting sessions in Access Pass (Subscription) and Pay As You Go modes, all of your installed programs and games will be there.
The same Cloud PC can be started in either mode. So, if you ever hit your 8-hour limit, you can immediately keep playing by using Pay As You Go for temporary overage.
Access Pass (Subscription) sessions on Stim.io also have a 20-minute idle timeout. This means your Cloud PC will shut down if you don't use it for 20 minutes. Pay-as-you-go sessions have no idle timeout.