It's not that it's an arbitrary system, Mark. It's that any system with sufficiently fine temporal resolution to divide the interval between a photo's being taken and being printed into "meaningful" (and financially lucrative) categories is absolutely unenforceable. Except in rare instances where the technology changed overnight, or the photo paper is labeled and thus can be dated, there is no way to reliably determine whether a photo was printed within one year, or two years, or three years, or... of being taken.
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