I challenge you guys who use the push button, to graph your plug "on" time against a stop watch. I'd bet you'd be surprised to find out just how much your "8 seconds" or whatever varies. Sometimes our concept of time is affected by body temperature (I know, sounds like a lot of B.S., but I've heard of studies that related it to this), and your 8 seconds on a freezing cold day, may be a bit shorter than on a nice summer day. Anybody who burns out plugs with a push button either has a warped sense of time, or isn't holding them on long enough, and then going back for a re-fry in too short a duty cycle. Ideally, you really ought to be looking at 10 or 11 seconds for maximum effect, but that is getting too close to the hairy edge without a timing mechanism more reliable than your brain.