So far our adversaries have all had enough time to decide it was a glitch and not real, thus avoiding the launch of a counter strike.
Growing up outside of Ellsworth AFB in the 1960s, we knew we had 15 minutes to tell our loved ones goodbye, get out the lawn chairs, and watch the show. The outgoing Minutemen missiles would have departed before the Soviet missiles would have re-entered above the Dakotas.