by 
Hollywood
ANSWERS: 3
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This is the longest I could find: 17 months 11 days. http://www.bly.cc/roast/1999/sld031.htm
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I found this at http://www.cincinnati.com/freetime/strange/031504_strange.html A "stone baby," from a tubal, ovarian or abdominal pregnancy where the fetus is never expelled and becomes calcified, says Jan Bondeson in "The Two-Headed Boy, and Other Medical Marvels." It may cause initial pain but go undiagnosed for years or even decades. Fetal age is hard to determine due to drying up and shrinking. In a remarkable 1674 case in Germany, pregnant 48-year- old Anna Mullern went into labor but the pains lasted seven weeks, says Bondeson. When they ceased, her belly remained swollen. Anna recovered, and though convinced she was still carrying her first unborn child, went on to bear two healthy children. When she died at age 94, a surgeon discovered in her belly "a hard mass of the form and size of a large Ninepin-Bowl." The lithopedion was taken before the Royal Society of London.
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There have been cases of calcified fetuses found in 70 year old women. That would mean they had been carrying them for 30+ years. I don't know if that qualifies as 'pregnancy' though.
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