As soon as you cross a point threshold that earns a membership extension, the expiration date on your account will be extended by exactly one week. You'll also receive an email informing you of your new membership expiration date. You can view your membership expiration date at any point at your member profile.
Neither your payment plan nor renewal settings will change when this reward is earned. So if you are paying monthly for your membership, your expiration date will scoot back by one (or more!) weeks. As a result, you'll still make 12 monthly payments but your membership may last longer than a year.
The maximum number of weekly extensions you can earn in a single month is four.