Depending on the chosen contract duration, your contract renews 12 or 24 months after the initial order. You can check these details on your invoice.
Your contract renews by the same term automatically, provided you do not cancel no later than one month prior to renewal.
Hint: If you'd like to have a look at previous invoices, you can simply find them in your dashboard. Click on Plan & Billing on the very left to get to the respective section.