a cast member once told me they drop the reservation if you don't arrive within 15 minutes after the reservation time. they also charge you a fee if you miss it.
1) Some Cast Members are simply wrong about the ADR and No-Show Penalty.
2) The "15 minutes" mentioned assumes a Grace Period.
. . . Disney does not have ADR Grace Periods
. . . some eateries may give a courtesy allowance, if they are not too busy
. . . but, it is not "policy"
. . . in crowded times, do not expect restaurants to hold the ADR past the ADR time
3) If they cancel your ADR, charging the $10 No-Show Penalty is not automatic.
. . . only the restaurant "Duty Manager" at the end of the day can make the decision to charge the penalty
. . . the podium CM (aka: SEATER) presses a computer key to denote a No-Show, at the Podium CM's discretion
. . . at the end of the day, the manager looks at the computer and sees all the marked ADRs that were identified as No-Show
. . . the manager then either let's it pass without a fee or hits a key to charge the guest
4)
See the above ADR Times and Tardiness "411" guidelines.
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NOTE1:
As for ADR Policy "these are not rules, but more like guidelines".
As an example: Although WDW wants you to check-in 15-minutes early, some eateries do not permit check-in until 5-minutes before your ADR time.
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NOTE2:
Many eateries allow folks who missed an ADR to simply show up at the podium anytime during the day and apologize and they do not get charged a No Show Penalty.