add lower bound

main.rb

@@ -123,6 +123,9 @@ bot.run(true)
 logger.info("Starting bot main loop")
 loop do
   timer = Astro::Moon.phase.phase * (3600 * (1 + rand(3)))
+  if timer < 900 #lower limit of 15 minutes
+    timer = 900
+  end
   logger.info("sleeping for #{timer} seconds")
   sleep timer
   t = Time.new