It is 15:20 on a November afternoon. The summit cairn is in sight, perhaps twenty minutes away. You have walked for four hours to get here, you drove three hours yesterday, and your friend is already striding ahead. Cloud is building in the west. Sunset is a little after 16:00. Nobody in the group says "we should turn round", because nobody wants to be the one who says it.
In this lesson
Daylight budget: estimating time to sunset
Why the number varies
Turnaround times
Turning back with the summit in sight
The sunk cost trap
Normalcy bias and the slow-onset emergency
Human-factor traps: the FACETS checklist
The pattern
Check yourself
Key points
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The rest of this lesson is in the full course
Every module, practical and exam, self-paced and private, with a certificate at the end.
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