resurfaces a rink without retracing its own track by driving in slightly
overlapping concentric ovals, approximately one-half the width of
the ice. This is usually accomplished in a clockwise motion, although
direction is irrelevant.
The actual number of passes required to
complete the task is determined by the overall width of the rink
and the width of the Zamboni blade.
Many NHL arenas now employ two Zamboni machines at the same time
to cut resurfacing time in half.