The QF instructions state that the bottle be microwaved for 10 seconds but mic wattages vary from model to model.

As an example, the mic at the mini-mart by my house is so powerful, it took only 7 seconds to heat a bottle of Magnum synthetic (basicly a QF "clone") well over 100 degrees! It took nearly ten minutes for the green box to finally appear at the 100F mark. The overheat didnt seem to faze the Magnum though, as it still passed the integrity checks with flying colors. :thumbsup: