Not too sure, you can go to Qriocity.com and under Account>Wallet, you can actually setup your wallet to automatically renew subscriptions which isn't the simplest way to go about it, but at least it won't run out!
Better yet, if you go your Account Info on playstation.com, then you scroll down to Manage Account, it will take you to another website. Once you're there, click on View Services, which is the last option on the page. Then, you'll see a list of Services you're subscribed to. If you click on PlayStation Plus, it takes you to another page and you'll have to click on PlayStation Plus again and it'll show your sign up date and your expiration date. You can cancel automatic renewal here as well.
Mine expires and renews automatically on the 29th of September, woot!
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