Please remember the auto wait time signs post the wait time when the person holding the transponder card reaches the front of the line. The wait increases in the morning and after parade often faster than the system can update the sign. The system may be programmed to compensate, but variables exist such as technical issues that may increase the wait. 20 minutes of downtime is the rule of thumb before a ride/queue is evacuated.
Two rules of thumb are used at fastpass mege point. One is not letting it back up keeping the wait less than 5 minutes for fastpass. The other is keeping the end of the line at a land mark to keep the wait less than 10 minutes. If the fastpass line gets backed up it is extremely difficult to catch up. Remember, there is nothing to stop a whole bunch of people with fastpasses to show up at the exact same time.
Two rules of thumb are used at fastpass mege point. One is not letting it back up keeping the wait less than 5 minutes for fastpass. The other is keeping the end of the line at a land mark to keep the wait less than 10 minutes. If the fastpass line gets backed up it is extremely difficult to catch up. Remember, there is nothing to stop a whole bunch of people with fastpasses to show up at the exact same time.