I'm sorry, i probably didn't explain myself well earlier. Make every length, try everything, and you will find something you like. I use ProChucks length cord, and 17-20cms cord and chain. pros are good for what there good and, and i find when im using longer cord for longer cord tricks, if there any shorter than 15 cms there not enough room. 17cms is perfect for me, great for infinite finger spins etc, wheels, wrist rolls. Each person is diffrent in preferance, and in size, so you must try and see what you like.
Michael