How do you change the notification duration in Apple macOS 11 / Big Sur

Question

How do I change the time of how long a notification stays on the screen in macOS 11 Big Sur? There's no setting for this in the system preferences.

I macOS Catalina the following command in Terminal worked (followed by a re-login to the system), whereas the number at the end of the command determined the number of seconds the notification stayed on the screen:

defaults write com.apple.notificationcenterui bannerTime -int 2

In earlier versions of macOS the command looked like this:

defaults write com.apple.notificationcenterui bannerTime 2

None of these commands seems to work on macOS 11 Big Sur.

Answer 1

Judging by the output of defaults read com.apple.notificationcenterui it appears that specific preference domain key is no longer available. Additionally, this Reddit post seems to say the same thing.

I'm guessing that Apple removed this key (along with a lot of other com.apple.notificationcenterui preference keys given that the domain now only contains last-analytics-stamp and widgets) around the same time that they introduced managing Notification Center configurations via MDM (see: https://developer.apple.com/documentation/devicemanagement/notifications) because a user-defined bannerTime (if it were set to, say, 0) could in theory interfere/override with a MDM administrator's defined settings for how Notification Center notification banners are presented.