Surely what you say is as important as how much you talk. I suppose you can assign someone literally to just fill up a certain percentage of a conversation with words (though I wouldn't trust someone accurately to gauge whether they were speaking, say, 30% of the time or 40% of the time), but you can't assign someone to have something to say a given percentage of the time.
On a certain level what you are taking about matters. But lots of times it doesn’t. When I’m in a pub talking to someone about their weather, or what they’re drinking, or a sports game, I don’t really care about the content of the conversation.
A lot of the time conversations are just there to have some company and socializing is for the sake of socializing.
