Someone gave me a box of off the wall stuff for Christmas, One of the items was a jigless, jigsaw puzzle, called Scramble Squares. Just 9 pieces to lay out in a 3x3 grid. I looked at it and thought ho-hum this ought to take 3 minutes, tops, but fortunately didn't say it out loud.
It's been sitting on my desk, unopened, until the other day somebody said, "I'll call you back in 5 minutes." Great I'll whip this sucker together and that'll help clear off the desk. They didn't call back for 8 minutes....... it wasn't enough.