How to change how long notifications stay on a Mac?
Solution 1:
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
Solution 2:
On newer os, you can’t change this.
- https://apple.stackexchange.com/a/269022/5472
On older os, you can customize the timing:
defaults write com.apple.notificationcenterui bannerTime 2
Works for me on El Capitan.