(NSFW) How long after this activity should you get tested for STDs?

So my friend had oral sex from a prostitute with a condom on – and took a serious shower afterwards and put on a lot of anti-bacteria by the way, so how long does he wait to take tests to see if he caught anything (and by anything I mean all the above – tests for everything – herpes, HIV, chlamydia, syphilis, just everything) because I heard some STDs can’t be recognized until 4 months after the person was infected from the sexual encounter!

And also what tests are they? As in, can it all be found with one test? Like a blood sample maybe.

This is so serious, please help me I appreciate it so much