The LastLogonReplicationInterval element represents the duration, in days, during which the last logon time for a principal is replicated. See [MS-DRSR].

     name="LastLogonReplicationInterval" nillable="true" type="ser:duration" />

The LastLogonReplicationInterval element is populated from the domainDNS!msDS-LogonTimeSyncInterval attribute on the domain NC root object ([MS-ADTS] section If this attribute is present, the element is populated with domainDNS!msDS-LogonTimeSyncInterval days, 0 hours, 0 minutes, and 0 seconds, encoded in ser:duration format (a restricted form of xs:duration (see [XMLSCHEMA2], section<35>; otherwise the server returns a null ActiveDirectoryDomain/LastLogonReplicationInterval element.