The only certainty for all 2.5" HDDs manufactured in the 90s to date + enclosure case USB3.0 parked the heads in a safe place only when all cables are disconnected and the power is cut off?

With the power cut via USB3.0 cable, how many seconds does it take to park the heads of the 2.5" HDD

When the enclosure case USB3.0 is a few centimeters from the PC and the USB cable is disconnected, it comes out quickly and there is a shock in the case. Is this the same speed as the time needed to park the heads of the 2.5" HDDs?