You have 180 days to file with the EEOC.
I think the SOL is two years for FMLA violations that result in terminations.
But not all wrongful terms are created equal. The SOL depends on the type of wrongful term you think you have.
I don't agree with the poster above; if the EEOC is not involved, then in my view it's 97%, not 99%, sure that you weren't wrongfully terminated. There's a SLIGHT chance that you still were. But not much of one.