public int getAllowedClockSkew() throws GuacamoleException {
        return environment.getProperty(OPENID_ALLOWED_CLOCK_SKEW, DEFAULT_ALLOWED_CLOCK_SKEW);
    }
Returns the amount of clock skew tolerated for timestamp comparisons
between the Guacamole server and OpenID service clocks, in seconds. Too
much clock skew will affect token expiration calculations, possibly
allowing old tokens to be used. By default, this will be 30.

@return
    The amount of clock skew tolerated for timestamp comparisons, in
    seconds.

@throws GuacamoleException
    If guacamole.properties cannot be parsed.
extensions/guacamole-auth-sso/modules/guacamole-auth-sso-openid/src/main/java/org/apache/guacamole/auth/openid/conf/ConfigurationService.java