You can use the Start-EdgeSynchronization cmdlet to force synchronization to start immediately. You may want to do this to start initial replication immediately after you create the Edge Subscription or if you have made significant changes to the configuration or recipients in Active Directory. The Start-EdgeSynchronization cmdlet resets the EdgeSync synchronization schedule. The time of the subsequent synchronization intervals is based on the time that this command is initiated.
If you try to run this procedure during regular synchronization, an error will occur.