the.com/egg timer

Analog guilt trip that turns boiling water into a deadline.

means A small device, often a sand-filled hourglass or a clockwork timer, used to measure the few minutes needed to boil an egg.

from The compound is exactly what it sounds — 'egg' plus 'timer' — a plain-spoken English pairing with no hidden trick. The sand-glass version borrows the much older hourglass design, used for centuries at sea and in pulpits to measure fixed stretches of time; it was simply rescaled for the kitchen, with just enough sand to run out around the same time an egg turns from liquid to lunch.

original sand
Three minutes was chosen to match soft-boiled eggs exactly
now metaphorical
Used for parking meters and standup meetings nobody times
sand alternative
Modern ones use heat-sensing color change, no grains needed
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