No matter when you begin your subscription, your subscription is good for 30 days. Below are the steps on how to see when a subscription is due, the amount, and the date the charge will be performed.
Log into C2
Click on your name in the upper right corner of the screen
Click on Subscriptions and Plans
You can also see the exact date you subscribed for a particular strategy by visiting the strategy detail page. You will see a little pull-down tab on the top of the page, just click on it.