Send just one alert only?

What if you want to just send one alert after waiting 10 minutes and no more? Can you have two durations on one rule? Such as DURATION > 10 DURATION < 15. When I tried that it did not seem to work.

Also, this is working correctly but I am trying to find the setting for this. I get an alert on a purple and red, and by alert I mean an email I have setup in the alerts file. I do NOT get one on a yellow, though the webpage is updated for the yellow alarm. Where is this setting. I thought to find it in hobbitserver.cfg but all I see there are PAGELEVELS and all 3 colors are listed in it.

Thanks again Wes