I have not been working my Cold Heat as much as I should be, so this July 4th, I went out to fix that. See the video below for the run, flaws and all. When I run this in a class, 2 seconds flat is within time, anything over 2 seconds does not count. I know some instructors will give a grace period of .05 or so, and that is fine, but I prefer the flat time.
Here is a link to the original post and a follow-up.