@gragroot at least 115 cm, but strings B, C, E and F and some of the A strings will probably need to be longer because they use more knots in the pattern.
@deblemon yes, but there's not an absolute correct way segment knot... it's whatever way is easiest for you and varies by each maker. @halokiwi has a very helpful picture tutorial at the bottom of their profile page that helps explain how to divide a pattern into sections for segment knotting. And there's also a video tutorial on pattern #27252 by @innovate 😊