The time frame in which you have to file a lawsuit will vary. It is set out by what is called a statute of limitations. In general, in Connecticut, you must bring a lawsuit for injuries sustained in a car accident within two years of that accident. (See Connecticut General Statute § 52-584.)
But, there are situations that have different rules. The most frequent example is a car accident where an individual dies. In that scenario the lawsuit must be brought within two years of the date of death and not more than five years from the date of the car accident that caused the death. See Connecticut General Statute § 52-555. Please note that the two year statute of limitation does not mean you should wait a month, six months or longer to seek medical treatment. Your failure to seek medical treatment immediately for your injuries will have a negative impact on your case.
In addition, any claim against a town or the State of Connecticut is subject to severe restrictions which limit the time to bring a lawsuit. Similarly, there are strict notice provisions that are extremely time sensitive that must be complied with in order to assert a valid lawsuit. These limitations and requirements are another reason you should hire a lawyer.