How much time do I have to file a personal injury claim for a wreck with a tractor-trailer ?
In the wreck took place in Tennessee you should assume you only have one year to bring a legal action against the people and companies that caused the wreck unless a competent Tennessee lawyer with knowledge of all of the circumstances tells you to the contrary.
However, it would be a mistake to wait any significant time to call a lawyer. The insurance and trucking companies often have expert witnesses and lawyers go to the scenes of serious trucking accidents. They are gathering evidence and preparing for a defense, and you need to have a lawyer start doing the same for you. Waiting even thirty days to get legal assistance may mean that valuable evidence is gone and therefore I urge you to contact a lawyer as soon as possible.