1) If you are late, they ressie is canceled --- at least officially.
2) In non-busy times, they usually give you 15-minutes.
3) If they cancel the ADR, you go to the Wait List.
4) If they are busy, like holidays or
free dining, there is no grace period.
5) Best practice is to be on time.
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6) I can personally see no reason to be late for an ADR.
7) To me, being late for any appt is inconsiderate and rude.
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