Many experienced people said that chlamydia and gonorrhea longest known infection was 4 years. Is it true? How many days human body persist it?

Chlamydia and GC. Untreated these infections can last for years, yes. But one risks the chance of a disseminated infection that can be difficult to treat. Thus regular testing is key along with treatment for any exposure--even if the test is negative is a good public health practice for stds.