Statistically the odds are against a short sale closing by November 30, 2009. You have 99 days from today to close on a home to get your $8,000 first time buyer tax credit. If the tax credit is important then either buy from a seller that is not short or a bank owned. I would suggest you go out now and find your home because time is running out. You don't want to plan to close on November 30Th because if there is any delay you will not qualify for the tax credit.
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Plain and simple it's a gamble. No one knows exactly how long your short sale will take to close. There are lots of variables. I have worked on several short sales, and have not had one close in under 90 days. You should expect that you won't get the credit, or be pleasantly surprised if you do.
Or... you might look for another property. Talk to your agent for guidance.