Wiggle room stuff gets bananas if you have a rebreather. Coming from OC tech world and moving into RB tech world, its night and day.
Derek and I created a new verb, "Drakered". It's when you go on a dive and wind up with four to six hours of decompression because you weren't entirely sure what your buddy had planned for the day.
"Don Sixed" would be 12 hours because of inattention.