There are a few relevant deadlines:
1. If you're in custody, the state has 90 days to indict you or the judge should release you on a PR bond, or one you can afford.
2. The state has 180 days, or until the end of the term of the next grand jury impaneled after the charge was filed. If not, they must dismiss, but can refile.
3. They have until the end of the statute of limitations to have a grand jury indict your case.
Joseph Vinas answers questions on Avvo for general information and not as legal advice. Those answers do not establish an attorney/client relationship. Please contact Mr. Vinas at (713) 229-9992 for a FREE CONSULTATION or visit his website at www.vgsfirm.com
I would add to Mr. Vinas' excellent answer that you should be looking for a good DWI defense lawyer during this time you are waiting. Why? Because the sooner a good DWI defense lawyer starts work on your case, generally the better your chances of successfully defending against the charge.
Answers on Avvo are for general information purposes only and should not be relied upon as legal advice. No attorney / client relationship is created by providing this answer. For specific advice about your situation, you should consult a competent attorney of your choosing.