A blink lasts between 100 and 150ms and a person blinks 10 to 15 times a minute. World average life expectancy is 67 years (24455 days, or 586920 hours, or 35,215,200 minutes). Say you sleep the average 7 hours a night, that’s 19.5 years of your life spent asleep.

Of the other 17 hours, between 1 to 2.25 seconds per minute is spent blinking, so you spend between 17 and 38.25 minutes of your waking day in the dark. Over your lifetime this is between a year to two years of your waking life spent in darkness.

This is your life: 20 years asleep, and 2 years blind.

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