From a practical, operative view, that may be a short period of time. I only have to look back to the more recent situation in New York City with the motor vehicle running down people on the street, and the British went back and looked at their records and determined that they had missed something in a telephone call that would have been helpful. I don't know whether it was 90 days or more, but it just seems that frequently it's the necessity to go back maybe a bit longer, and then make the connections not only directly to that, but to other events.
On December 7th, 2017. See this statement in context.