
Microsoft CSS wants to share with you an informational article on our Docs that describe the minor updates and major updates and how to get extension of the upgrade window.
Microsoft is committed to delivering predictable updates to the service. Updates are continuous, touchless updates that provide new features and functionality. They eliminate the need to do expensive upgrades every few years. Administrators can set a maintenance window for each environment that determines when Microsoft is allowed to update that environment. For more information, see Managing Updates in the Business Central Admin Center. Microsoft then schedules updates of the business functionality to be applied during these maintenance windows.
Therefore the product group created information about it that should answer all your questions about this topic:
Major Updates and Minor Updates for Business Central Online - Business Central | Microsoft Docs