How long does a court have to bring in a dwi case?

You are talking about his statutory and constitutional right to a speedy trial; and generally speaking the prosecution has six months -- but, this can be a very complicated calculation depending upon whether adjournments were granted on consent of the parties. In any event, your husband needs an attorney immediately.

Misdemeanor - 90 days; felony - 6 months. However, not all days count as there are a variety of exclusions.

They have 6 months on a felony and 90 days on a misdemeanor. There are many exceptions. Ask his attorney or hire one!

There is a time limit by which the People (i.e., the District Attorney) must state on the record that they are ready for trial. There should still be plenty of time for your husbands case to be prosecuted, although calculating the exact time frames can be rather complicated. You should (a) speak with an attorney soon, and (b) NOT contact the court or the DA to inquire as to why things are taking so long. Don't wake a sleeping dog.