ADR Times and Tardiness "411":
1) WDW advises you to be at the ADR 15-minutes early.
2) You are expected to meet your ADR time, just like any other appt.
3) Being on-time is your responsibility, not that of WDW.
4) If late, they *can* cancel the ADR.
5) Under normal conditions, they usually allow up to a 15-minute lateness, but this is kindness, not a Grace Period.
6) If really busy, (eg, Free Dining, Holidays), there might be no Grace allowance.
7) If you miss the ADR, you *might* have the ability to wait for a table.
8) For waiting times, there is no estimate, waits of 1-1½ hrs are common.
. . . if the eatery is not too busy, wait times could be minimal
. . . just depends upon the individual day-time-etc
9) They also have the option of canceling and just sending you away.
10) These options are at the discretion of the SEATER on duty at the podium.
11) Plus, it is up the eatery manager to decide if you get charged the $10/person no-show fee.
NOTE: If it is near the end of the ressie meal period or the end of park hours, do not expect ANY leniency in being late. You are expected to make your ressie time, with zero excuses. Cortesy is courtesy. Plan to make your ressie or ADR times.