As you may be aware, Outlook clients (for Windows, mobile on iOS and Android or OWA) allow your end-users to shorten a meeting when organizing it.
Well, Exchange administrators can now apply the shorten meeting settings at the organization level using Exchange Online PowerShell (use the V2 version available here https://www.powershellgallery.com/packages/ExchangeOnlineManagement/)
Connect-ExchangeOnline
Example to start late the meeting by 5 minutes both long (more than 1 hour) and short (less than 1 hour) meetings
Set-OrganizationConfig -ShortenEventScopeDefault 2 –DefaultMinutesToReduceLongEventsBy 5 –DefaultMinutesToReduceShortEventsBy 5