'We did have ground distance charts in the 727 with waiting times, with the parking brake not set, that you had to follow if you had a long taxi, landing distance and estimated takeoff distances were including in the calculations. I can only remember a couple of times we were ever affected by the chart in the ten years I flew 727s, so it was not much of a limiting factor. If I remember correctly if you were parked for more than an hour there was no problem'
We avoided that problem by not having those charts !