The timing that we have been using for runs starts when you get control of barbie in the car and ends when the screen starts to fade to black a the end of the last runway. Just noticed there was a run that was on emulator (not marked) and the timing was actually 7 seconds better than what is listed.

Also for any % there are no clear rules but the ones we've been unofficially using are complete all the levels and runways while getting the bad ending (the try again ending) without that clearly stated you can get the same ending via a quick death in the first level in 6 seconds.