How long does the average pen last before running out of ink?

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How long does the average pen last before running out of ink?
You are bound to find advertised averages as stated by the pen manufacturer, but otherwise that is an awfully broad question.





A review of Sanford Liquid Expresso pens on epinions.com estimates two months for this type of pen.


http://www.epinions.com/review/Sanford_L...





Gullible.info asserts that "the average pen could draw a line 1.5 miles long before running out of ink."


http://64.233.169.104/search?q=cache:IoX...





The Fisher Space Pen claims to raise the bar to "a continuous line over 30 miles long," purportedly lasting 80 YEARS!


http://thewritersedge.com/fisher.millenn...





The real answer: who knows? Do some experiments and find out! Let us know what you discover.