The digital certificate acquired by a signer is valid only for 1 year. It is possible to check the expiration date from your GMO Sign account profile.
Please Note - Before 90 days of expiration date, signer(s) would receive reminder emails on their registered email address to renew digital certificate.
Once the renewal procedure gets completed and signer(s) receives the certificate with new expiration date, this expiration date would be equivalent to 1 year + 1 month after the actual expiration date. Similarly, at the time of upgrading digital certificate, the expiration date value is calculated in same way after the completion date.