Take a look at the source:

832         if ( $remember ) {
833                 /**
834                  * Filter the duration of the authentication cookie expiration period.
835                  *
836                  * @since 2.8.0
837                  *
838                  * @param int  $length   Duration of the expiration period in seconds.
839                  * @param int  $user_id  User ID.
840                  * @param bool $remember Whether to remember the user login. Default false.
841                  */
842                 $expiration = time() + apply_filters( \'auth_cookie_expiration\', 14 * DAY_IN_SECONDS, $user_id, $remember );
843 
844                 /*
845                  * Ensure the browser will continue to send the cookie after the expiration time is reached.
846                  * Needed for the login grace period in wp_validate_auth_cookie().
847                  */
848                 $expire = $expiration + ( 12 * HOUR_IN_SECONDS );
849         } else {
850                 /** This filter is documented in wp-includes/pluggable.php */
851                 $expiration = time() + apply_filters( \'auth_cookie_expiration\', 2 * DAY_IN_SECONDS, $user_id, $remember );
852                 $expire = 0;
853         }

请注意，该函数是可插入的auth_cookie_expiration 过滤器可用于更改这两个值。