Ten is the number of reverends who would’ve had to faint before we would’ve had to halt Uncle Chuck’s wedding. Said another way, a minimum of eight percent of the attendees would have passed out before Uncle Chuck had to pause the proceedings and wait for one of them to revive.  If we assume that the couple were not going to pass out because they were too fired up, then we would mathematically expect 88 percent of the attendees to have passed out before a halt was necessary.  Thankfully, no one fainted and this situation is hypothetical.