As strange as these ad/tip toaster style popups are, they don't have a setting of their own to be able to disable or reduce the duration.
They are piggybacked on to the auto update notifications, so you would have to either disable the auto update notifications (which aren't working well for many users right now) or reduce the popup duration. However, as has been mentioned the duration function also seems to be having an issue as well as the update notifications themselves.