1. APRX stands for approximately. If the time and date given on the NOTAM does NOT say APRX, then the NOTAM expires at that time.

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2. A NOTAM might cover several weeks or even longer.

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3. Note that the time and date is given in Zulu, so that in Vancouver, 05:00Z on October 6th represents 10 pm on October 5th.

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4. There is no need for a cancelling NOTAM if an exact time is given in the original NOTAM.