It appears not long.
According to one source, a long storage period is anything between 4 and 24 weeks. http://books.google.com.au/books?id=...sition&f=false
Another source http://www.chevronglobalaviation.com...ech_review.pdf has this:
Quote:
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Storage Stability Instability of jet fuel during storage is generally not a problem because most fuel is used within weeks or months of its manufacture. Storage stability is an issue for the military, which often stores fuel for emergency use. And it can be an issue at small airports that don’t use a lot of fuel. Jet fuel that has been properly manufactured, stored, and handled should remain stable for at least one year. Jet fuel subjected to longer storage or to improper storage or handling should be tested to be sure it meets all applicable specification requirements before use. Because it is the more reactive fuel components that cause instability, storage stability is influenced by fuel composition. It is also influenced by storage conditions; instability reactions occur faster and to a greater extent at higher ambient temperatures. Antioxidants may be added to fuel to improve its storage stability.
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So my guess is with fuel refining effectively stopping dead in November 1997, there's going to be next to no useable pre-war fuel by 2000/2001.
Note that additives are included in modern fuels to increase stability (reflected in the above periods) and are unlikely to be available post nuke.
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