From my experience, it is month to month.
Use these steps, when you are ready to cancel your subscription:
1 Open the Settings app.
2 Tap iTunes & App Store.
3 Tap your Apple ID.
4 Tap View Apple ID.
5 Enter the password associated with your Apple ID and tap OK.
6 Under the Subscriptions section, tap Manage.
7 Choose a subscription.
8 Toggle the Automatic Renewal switch off.
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