A:Answer The 30-second delay is designed to help minimize false alarms, which are one of the most common complaints about alarm systems from system owners and law enforcement. Approximately 98% of alarm activations are false, and the majority of false alarms are caused by family members when they are entering or exiting their home.
As an example, the ANSI/SIA CP-01 standard recommends a minimum delay of 30 seconds when the system armed while someone is at home. This lets another family member come home and open the door without instantly setting off the alarm.
With that said, Nest understands your concern and we continually look for thoughtful ways to improve our products while meeting the diverse needs of the people who use our products.