Once support for Windows 10 native notifications is released, users who choose to use Windows notifications will be able to utilize Windows OS specific settings for the length of time to display notifications. Mac does not have an OS specific setting, so will not have the support.
An error occurred while saving the commentAnonymous commented
What do you mean "Mac does not have an OS specific setting"? What would you call the Notifications Center? Of *COURSE* it has a system/OS setting for notifications, and Teams should implement support for it on the Mac.