I have serveral clusters of 3 servers each. It doesn't take long to to this 'Sync' of the schedules and calendars.
BUT having remote access to the servers is a must. 'dbcache flush' will free up the clusterbusy.
Before sync'ing the clusters on a regular basis, we were having lost meetings, schedule conflicts and other problems that were driving us nutz. Now all has been calm and peaceful.
Well worth adding to ur maintenance schedule. I do mine weekly.