Kite flying, special

This guy was amazing! He showed up at the kite festival of Laichingen, sat down on the meadow behind his box and started to reel off a line of 200 (!) identical small silver kites. There was only a light breeze and it took him about 20 minutes to unwind all of them. People ware fascinated to watch the shining snake growing into the blue sky.
I asked him, how long he worked on creating this line. He gave me a big grin and responded: "Long. Very long."