This tool can be used to calculate replication / Synchronization time in any eDirectory server.
This script will return the time taken data for the replication / synchronization in seconds.
Disclaimer: As with everything else at NetIQ Cool Solutions, this content is definitely not supported by NetIQ, so Customer Support will not be able to help you if it has any adverse effect on your environment. It just worked for at least one person, and perhaps it will be useful for you too. Be sure to test in a non-production environment.