From James Elkins, How to Use Your Eyes. London: Routledge, 2000—
A normal lifetime, for a person who lives in a developed nation, is about 30,000 days. Grass is in bloom for about 10,000 of those days, and certainly I could take one of them to sit down and get to know grass. But it is frightening how quickly life passes. I am a little over forty years old, and that means I have used up more than half of those 10,000 days that I have been given for viewing grass. If I'm lucky, I have about 30 summers left. Each summer has about 60 days of good weather, and maybe 20 days when I actually get outside and have some time to spare. That adds up to a little over 600 chances to see grass. They can easily slip away.