When a woman says she'll be ready to go out in five more minutes, she's using the same meaning of time as when a man says the football games's just got five minutes left. Neither of them is counting time outs, commercials, or replays. And so on. Women on a girls' night out talk the whole time. Men use restrooms for purely biological reasons.
Women use restrooms as social lounges.
Men in a restrooms will never speak a word to each other. Women who've never met will leave a restroom giggling together like old friends.