Honestly, I don't think there is really an answer to this question. Personally I like to respond to things quickly but the client on the other side could always be holding things up. Speak to your lawyer if things are not moving.
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There is no set answer. It's good practice to put deadlines for acceptance of offers and counteroffers.
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I agree with my collegue that there is no set time limit. However, if I make an offer, I insert a time limit for response - depending on the situation, but 14 days from receipt of the offer by certified mail is reasonable. Offers I have received also include that language. Good luck!!
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