If you run out of your Monthly Allotment for a Campaign.
It will Renew the following month.
The date the Allotment is Renewed is based on the date you Licensed your Territory.

If you Licensed your Territory on August 23rd. Your Campaign Allotment will be Renewed on the 23rd of every month.

To view the date you Licensed your Territory.
Click on Your Name in the top right corner.
A menu will open.
Click on the Account Settings item.
A new page will load.
Scroll to the bottom of the page.
You will see the Account menu in the bottom left corner.
Click on the Licenses item.

Here you will see a list of all of your Territories.
The Start Date column will show you when you Licensed that Territory.

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