After how much time of unprotected intercourse can the symptoms of HIV or any other STD can occur its being around 2.5 years to the intercourse..

See below. Not sure i understand the question. But. Most std's are readily apparent within a few days after unprotected intercourse. Hiv may not give symptoms for years and may take 6-12 months to become positive on a test. In terms of how long does it take to catch and std? One act of unprotected se is enough.