It is closer to 28 to 33 minutes for ICBM's from Russia.
The 3 phases of launch are;
Boost Phase: 3 to 5 minutes (this is the point of detection for the US side)
Midcourse Phase: about 25 minutes
Re-entry Phase: 2 minutes
The US might not have been using launch on warning protocols during the 1990's. As there are ways to reduce the effectiveness of this protocol, the US might have switched away from this protocol, read up on X-ray pin-down, it is a very interesting concept and use of SLBMs.
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