Frame Show/Hide
 

I have a hypothetical question here...

If I have myFrame:Show() when an event occurs...for example "You gain Spell Power," I can also have myFrame go away by utilizing the event "Spell Power fades from you" and myframe:Hide()

But if the event is somthing like "You gain an extra attack through sword specialization," how can I have that frame go away after a period of time since there's no event firing to trigger myFrame:Hide()? The extra attack never "fades" from you so what could I use to trigger hiding the fame?