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Your renewed certificate will be valid for 52 weeks from the date of expiration of your existing certificate. We therefore recommend that you renew your certificate before your existing one expires so that you can get maximum use from your renewed certificate. If you renew your certificate one month before it is due to expire, it will be valid for one month plus 52 weeks. If you renew your certificate one month after expiration, then your renewed certificate will be valid for 52 weeks less one month.