23.55 when I pushed stop on the stop watch. I was surprised myself since I thought I strung around 35 min. I use a Gamma 5003 crank and double pull on every cross string. The racquet had a 16x20 pattern so even more surprising. I had the strings cut before starting. It was a hybrid set up with CF topspin on the mains and Prince Premier on the crosses (both 17G). During the crosses I also hold the string in place with one hand and clamp with the other. I use the Parnell knot for everything. I can't believe I could be even faster with a Wise electronic machine with footpedal.