That all depends on if you're losing the shot. If your having consistent results throughout the series and aren't struggling to keep a working line, why change balls? If you end up losing the shot and you're third game scores are consistently worse than your first game scores, then whoever said this is probably on to something. Do you hear this from a person that watches you bowl or knows what your results are?
Simply put, an asymmetric ball will burn up faster, but that doesn't necessarily mean there is blanket statement that says 'do not use an asymmetric ball all night.' Depending on conditions, the time to change balls may be after the first game or it may be after you're finished. There are too many variables to simply say 'an asymmetric ball shouldn't be used all night' so consider the source of the advice and don't fix something if it isn't broken.
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