You should be getting the 5 seconds left message in your logs. I use it for all of my buff timers as such:
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If you can't get 5 seconds to work, you'll have to use 10 seconds or set up a custom timer clear hotkey - for example, make a hotkey in game that executes the command "/help vplay" which returns the text "/vplay", and then add /vplay as one of your end early strings in GINA. Or you could make a custom camp hotkey that executes /camp or /camp desk, /pause 250 (25 seconds), and then executes your clear timer command a la /help vplay, but you'd have to use that hotkey every time you camp to clear your timers.