While I was in the shower today, I started to think about light... And how much our eyes take in.

So lets say on average a person lives for 74 years, and that we sleep 1/3 of that. So we are awake about 49.33 years of our lives, which is 18,006.66 days, plus 12.33 days for leap years, so 18,019 rounded up. That totals out to 432,456 hours, or 25,947,360 minutes, or finally 1,556,841,600 seconds.

We blink on average about 10 times every minute, and a full blink takes about 1/3 of a second. So during the course of a day, we blink 9,600 times for a total of about 53.33 minutes of our eye being in the process of blinking. For about half of that time the pupil is covered, so 26.66 minutes of the waking day our pupils are not receiving light.

So total our eyes are open for 25,466,973.46 minutes during our lifetime, or about 1,528,018,407.6 seconds.

Light travels fast as we all know. 186,282.397 miles per second in a perfect vacuum, and just slightly slower in air. I'll use the vacuum total just because its hard to find the exact speed in air. So that means, over the course of your lifetime, assuming that you receive no light to your eyes when they are closed (which isn't entirely true, but we are assuming remember?), 2.84642932 × 10 to the fourteenth miles of light enter your eyes... Thats 284,642,932,000,000 miles of light (two hundred eighty four trillion, six hundred forty two billion, nine hundred thirty two million), or 11,385,717,280 times around the Earth, or 1,134,249,462.3 trips to and from the Moon.

Over a billion trips to the Moon and back. Sadly enough, 1,425,395,650,000 miles of that will be you searching for Lolcats on the internet...

It took me 279,423,596 miles of light to write this.