Any rules from Tick-Tock's canon can be considered unstrict - it's a comedic podcast, so they play pretty loosey-goosey with that stuff. There is a whole episode about meetings multiple other selves, though (in his case, it was Oscar Wilde). It causes a paradox, and the more of them you meet, the greater the effect, until some sort of dire calamity happens, like the complete unraveling of the timeline. But it's completely unclear how many times that needs to happen, or how many versions of one person need to be in the same room.