how long it takes for you to die once you realize it. It takes a long while for a plane to fall and crash. And it’s usually guaranteed death.
Couple misconceptions here
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Nearly all plane crashes happen on takeoff or landing. Most issues causing a crash from cruise are novel issues that are quickly rectified so they don't happen again
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The average person has little to no ability to differentiate a fatal issue from a non-fatal one. Basically every time there is an engine failure on takeoff, half the plane is screaming, "we're all going to die!" when there is no real cause for concern. It's the most common issue a multi-engine pilot trains for. Something really catastrophic has to happen for it to be life threatening (such as with the UPS crash a year ago)