Unlike "conventional" wells, these wells are known for a short production life span. Most gas will be produced in the First 36 months of production, then a rapid decline.
One site says Eight years:
http://www.marcellus-shale.us/Marcellus-production.htm
While the wells may last eight years, 80% of the gas is pumped in the first year:
http://seekingalpha.com/instablog/121744-mark-anthony/723041-implication-of-shale-gas-boom-and-bust-examined
Most fields are almost all gone within 3 years (through they may produce a small amount of gas for 20 years afterward):
http://www.investingdaily.com/16360/the-coming-natural-gas-explosion/
Report calling the Gas boom and bubble:
http://www.desmogblog.com/2013/05/08/interview-energy-investor-bill-powers-discusses-looming-shale-gas-bubble
http://peakoil.com/enviroment/the-fracked-up-usa-shale-gas-bubble
Shale Oil in the US:
Chart showing what is expected in Gas Production, rapid increase, quick peaking (c2017) then rapid decline:
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