How long is 21 seconds?

Put simply, twenty one seconds is equal to 21,000 milliseconds or 21,000,000 microseconds. If you calculate further, 21 seconds is equal to 0.35 minutes, or 0.0058 hours, or 0.00024 days.

Here's a closer look at what 21 seconds equals:

0.000034 weeks
0.00024 days
0.0058 hours
0.35 minutes
21,000 milliseconds
21,000,000 microseconds

This amount of time corresponds to:

Light traveling 3,911,922 miles (light speed is 186,282 miles per second)
Earth orbiting 388.5 miles (speed is 18.5 miles per second)
A bee flapping its wings 8,400 times (about 400 flaps per second)
A supersonic jet flying 23,415 feet (flies at 1,115 feet per second)
Sound traveling 23,625 feet (moves at about 1,125 feet per second in air)
Clapping 42 times (each clap takes 0.5 seconds)
Blinking about 30 times (each blink takes 0.7 seconds)
Switching a light on and off 7 times (each switch takes 3 seconds)