How soon does Monitoring Center call after alarm?

@Eagle328 wrote:
Everytime I’ve had a false alarm I’ve received a call with 30 seconds after cancelling it to confirm. That’s been my experience.

That is if you elect to receive those calls. It is not automatic that you get a call when the alarm is cancelled in time.

His Question was the time for a call when the alarm actually sounds & is not cancelled in time.