It's in the mid seventies during the day for the next few days so I took the opportunity to play with the settings on my 520. I want to see how low I could go and keep a fire going. I went to two teeth 3 1/2 air and 1 minute timer every 15 minutes (intermatic timer). It went out this evening. Tomorrow I'll relight it and try 2 teeth and 2 minutes per half hour. I hate when science projects go awry.