If all your doing is "Refinishing" which is just changing your surface texture or returning it back to what it was, then doing 4 sides is plenty.
The reason you want to do at least 4 "sides", is because doing just two, you are likely to have less material removed at the "equator" of those two sides. By doing at least 4 sides, you minimize that risk and it helps keep the ball in round.
Doing 6 sides minimizes the risk that much more. But I save that for doing a "True" Resurface.
Resurfacing: Is where you bring a ball back to a like "New" condition. Removing all nicks, scratches etc. You don't do a "Resurfacing" all the time, it removes a lot more material.
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