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for some anecdotal experience: my wife's car had a new battery near the end of 2006. walmart, bottom-dollar battery. it got used regularly for a while, but near march or so of 2008, had sat with no use of the car. someone wired in a radio incorrectly and it drained within about 2 weeks at most. it sat unused from march to.... july, i think. so, a solid 4 months with a completely dead battery that was new in let's say november of 2006. so a year and 4 months after new, sat dead.
that one came back to life and some significant prodding and lasted until it was replaced by the new owner in september of 2012. i don't know how much longer it would have lasted, but it wasn't showing any classic battery failure signs in our posession.
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