There's a maxim in EMS about the "golden hour".
In general, across a broad spectrum of traumatic (and some medical) issues, EMS has 1 hour from inception until Emergency Room arrival and that every minute after that hour degrades the patient possibility for a positive outcome.
The concept has been, for the most part, proven to be inaccurate, but it still lingers in EMS training and in EMS methods.
In Dubai, they're trying to address the issue with 160 mph first responder sports car.
As this article points out, “Overemphasis on response-time interval
metrics may lead to unintended, but harmful, consequences (e.g.,
emergency vehicle crashes) and an undeserved confidence in quality and
performance,” but it's GREAT for PR.