Here is the life-span of various things:

• A lightning bolt lasts 45 to 55 microseconds.
• The average running shoe worn by the average runner on an average surface will last 350 to 500 miles.
• A hard pencil can write up to 30,000 words or draw a line more than 30 miles long.
• Most ball-point pens will draw a line 4,000 to 7,500 feet long.
• Leather combat boots have a wartime life-span of six months, a peacetime life-span of eight months (The army walks during war and …