--server-signed-url-max-age

Maximum lifetime in seconds for a signed URL. The signature’s expires bound is capped at this many seconds from issue, so a URL stops working once it elapses even if a later expiry was requested.

Applies only when --server-signed-url is set. It also caps the expiry of signed asset links, which otherwise run for --server-additional-asset-expiration.

This is an Enterprise-tier flag.