User Configuration > Administrative Templates > Microsoft Outlook 2016 > Outlook Options > Preferences > Calendar Options > Office.com Sharing Service
User
HKCU\software\policies\microsoft\office\16.0\outlook\options\pubcal
By default, Outlook does not publish calendars to Office.com more often then the publish interval set by Office.com. This setting allows users to publish calendars more often than the Office.com interval specifies.