I just started to use the wiggle pierce and I was wondering if the wiggle waits for the pierce delay to end before wiggling or only wiggles for a certain parts of the delay. 
The cutter keeps wiggling back and forth for the pierce delay. If you increase the pierce delay it will wiggle for longer. Note that the timing assumes you aren’t using any feed arte override. If you are overriding the feed rate then the timing will be wrong.