@DNielsen Thanks for reaching out!
When restringing your tent you'll want to measure the length of all the poles, and then add a couple of feet of cord in order make sure you have enoughlength for knots, doubling back, and/or any errors you may make in cutting the cord. It's important to remember that you'll actually use less cord than the length of the poles, as you want it to be stretched out a bit (when the poles are assembled) so the tension holds the poles together. But it is always a good idea to purchase a little bit more length of cord than poles to allow you some room for error when restringing your poles.
Hopefully this helps, thanks!