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It could be a bad translation of estimated record time based on a standard shorter length tape.
Longer tapes tend to be thinner and more prone to be stretched by decks (some decks were worse than others). I'd imagine that if that was a problem it should be mentioned in the manual. The worst that I can imagine happening if you try one of those tapes is the tape slowly becoming unplayable. I'd record and play back short test recordings on that tape starting at 30 seconds and progressing up to 2 hours if there is no signs of stretching or other troubles after progressing through those tests then odds are there will never be problems.
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