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A heartbeat

~ 1 second

One relaxed beat at 60 beats per minute.

Turn the dial. Watch familiar time become strange.

Drag the dial, choose a milestone, or use the arrow keys.

Fine time position

10⁰ seconds

A blink~ 100 milliseconds
A deliberately representative blink, not a physiological limit.
A heartbeat~ 1 second
One relaxed beat at 60 beats per minute.
A breath~ 4 seconds
One minute holds about fifteen quiet breaths.
A minute60 seconds
Fifteen four-second breaths fit here.
An hour60 minutes
Sixty minutes, or 3,600 seconds.
A day24 hours
The familiar unit now contains 864,000 blinks.
A lunar month~ 29.53 days
One cycle of lunar phases, rounded to a second.
A year365.25 days
About 12.37 lunar cycles.
A human lifetime~ 80 years
A round editorial convention, not a prediction.
A century100 years
One and a quarter 80-year lifetimes.
Recorded history~ 5,000 years
Here defined as a useful round boundary, not a universal beginning.
Homo sapiens~ 300,000 years
About sixty spans of recorded history.
The last mass extinction~ 66 million years
About 220 Homo sapiens spans.
The age of Earth~ 4.54 billion years
About 69 extinction intervals.
The age of the universe~ 13.8 billion years
A little over three Earth ages.

How these durations were chosen

Durations are rounded to preserve comparison, not precision. A Julian year is defined here as 31,557,600 seconds; blink, breath, lifetime, and recorded history are editorial conventions. Lunar, human-origin, extinction, Earth, and cosmic estimates follow the cited references.