Hello and thanks so much for choosing this forum to pose your important legal question. I will do my best to give you some honest and accurate guidance.
This sound like a pretty unusual situation to say the least! I had never heard of anything remotely like this supposed "24 hours" law. So, I did some research (statutes and case law) and came up with nothing. So, in my opinion this is most likely a sort of "urban legend". The situation should be governed by the union by-laws. They could contain such a provision, although I very much doubt it. But, as far as a law there appears to be none.
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