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I have a webpage that will display notifications to OS X's notification (system notifications). But it will disappear in 10 to 15 seconds. Is there a way to change how long it stays? (and what about change to not disappear at all?)

I found several pages dated 2014, which suggested using

defaults write com.apple.notificationcenterui bannerTime 60

or use 3 instead to make it 3 seconds. But this method doesn't work for my Mavericks and El Capitan OS X.

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On newer os, you can’t change this.

On older os, you can customize the timing:

defaults write com.apple.notificationcenterui bannerTime 2

Works for me on El Capitan.

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I was able to get this to work as of Catalina (10.15.2)

First, you need to specify -int before the number of seconds parameter:

defaults write com.apple.notificationcenterui bannerTime -int 2

You then need to restart the NotificationCenter process by signing out/rebooting or running:

killall NotificationCenter
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