That’s a standard .NET Tooltip we use. From the Microsoft docs on AutoPopDelay:
The maximum time you can delay a popup is 5000 milliseconds. For longer durations, use the Show method to control the exact moment when the ToolTip is displayed.
5 seconds seems like a lot. I can't imagine a scenario where a 5 minute pop up delay makes sense. (Unless it says "hey user! wake up").If you really want that, you'd have to use GoObject OnEnterLeave to set your own timers.
That’s not particularly Go related… you should be able to find a thousand different .NET samples of timers with Google.