The DirSync process sync’s every three hours by default, with a random number between 1 and 10 minutes is added to the SyncTimeInterval to provide an additional time buffer to this three hour period.
This schedule can be changed by editing Microsoft.Online.DirSync.Scheduler.exe.Config in C:\Program Files\Microsoft Online Directory Sync. Change to read a different value for hours:minutes:seconds and restart the Microsoft Online Services Directory Synchronization Service.
Note that increasing the time sync interval will result in changes to the Active Directory not being synced until this time period has passed and so the longer the interval the greater risk that objects disabled or removed in the on-premise Active Directory are not replicated to Office 365 and therefore remain as a valid account within Office 365.
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