Changed "maxValidityInterval" to P6D

Author: malavolti

idem-fedops/HOWTO-Shibboleth/Identity Provider/Debian-Ubuntu/HOWTO Install and Configure a Shibboleth IdP v3.4.x on Debian-Ubuntu Linux with Apache2 + Jetty9.md

@@ -1193,7 +1193,7 @@ Translate the IdP messages in your language:
             Require a validUntil XML attribute on the root element and
             make sure its value is no more than 10 days into the future.
         -->
-        <MetadataFilter xsi:type="RequiredValidUntil" maxValidityInterval="P10D"/>
+        <MetadataFilter xsi:type="RequiredValidUntil" maxValidityInterval="P6D"/>
    
         <!-- Consume all SP metadata in the aggregate -->
         <MetadataFilter xsi:type="EntityRoleWhiteList">