I had the same question too when I started brewing... and was told by my brew supply guy an easy 6 months plus depending on the style of beer.
Honestly though... I have to work REALLY hard to make those bottles last that long, especially if the batch tastes good!
I store my bottles in the same room I ferment in (about mid 60's during the winter) Your storage temps are a lot higher and if it were me I'd be concerned about those higher temps. I am a big fan of cellaring my beers after they carb up, and I want those temps to be colder than what I fermented at (about mid 60's during the winter). So what I do is once they are carbed up where I like them I move them into the fridge, if I can, or I move them back to the coolest area in my store room.
HTH
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