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Pedantic Grognard
No, there's no time limit. Open Game Content released under the Open Game License 1.0a can always be used under the Open Game License 1.0a.Which means, if I'm reading you right, if you're new to publishing and want to put something out under 1.0/1.0a you gotta do it before 1.1 is released. Get in before the lock, as it were.
Is that what you're saying?
Now, any given publisher might enter into an agreement that limits its right to do so, but that doesn't affect anyone else's ability to sit down in the year 2525 and release their own D&D 3rd edition-compatible Pocket Player's Handbook.