Yes, the time to slow down is as you get within a hundred degrees or so of the max temp and then during the cool down.
This is key- depending on what type of an effect you want from your glaze. A glaze that yields a complex, matte or crystalline surface with a slow cool-down can be translucent or even transparent if the kiln is just switched off at its peak.
Either may be fine... but be aware of what you want.
At the moment I am after glossy glazes, but will bear that in mind when trying something different.
Like your signature line. And "All that glitters is not gold". (no, it´s my glossy glaze! hehe)