All of our subscription periods last at least one month. The monthly price will be displayed in the app before subscribing and charged to your iTunes account at confirmation of purchase. The subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. You can always turn off the auto-renewal via your Apple ID settings. Your account will be charged for the complete upcoming period (1 month) within 24-hours prior to the end of the current period.