I agree with Steve, it should be enough for crosses on an 16x19 racket. Though the tie off may be tricky. The best way to check, is to use the 17' length you have. Measure 19 widths with this length. If you have exactly 19 widths or more you are good to go. I do this all the time to measure crosses from a reel.
Machines: Gamma 6004 2-point w/ Wise 2086 & Babolat Sensor Dual