Three blondes are sitting in a bar chanting "51 days." After a while the bartender says to them, "Ladies, for the past 3 hours you have been sitting here chanting 51 days. Why?"

The blondes stop chanting and look up.

"Well," says one of the blondes, "we just finished a puzzle."

"So. What does that have to do with anything?" the bartender asked.

"Well, the box said 3 to 5 years. We finished it in 51 days."