"Aggregate sentences" usually refers to the maximum possible that COULD HAVE BEEN imposed under the law. The actual sentences and/or time served are less relevant. Another issue to start looking at is how recently these DUI's took place. When was the most recent offense?
If they were at least 5 years ago, you have better chances at obtaining a waiver for these offenses. (stop drinking and driving!)
Using your math, you have 181 days of actual confinement. What could have been imposed is irrelevant. You are inadmissible under INA 212(a)(2)(B). Travel is inadvisable in your situation.
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While written by an attorney who is a Florida Bar Certified Specialist in Immigration and Nationality Law, the statements herein should not be construed as legal advice. No attorney/client relationship has been created without a formal consultation with the attorney and the attorney has agreed to accept your case.
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