That's enough time, if true, to send a text message of goodbye/SOS. I timed myself and easily managed to tap out "Have fallen over badly. Send ambulance. Ta." therefore convincing me that it might actually be safer to fall from a really big mountain than a small one/stepladder.
Also thirty seconds is easily enough time to fit in a few pints, making your descent more pleasurable. Maybe just the one if you're a bit of a nancy.