@Penguins24 this pattern will not use string colors evenly, so you'll have to adjust lengths according to how many knots for each color is used. For example, colors B and I are barely used, so you could probably cut them about 30 inches/76cm or less. Where colors E and F would need to be longer at maybe 43in/100cm. And the black is used most so those should be longest, I'm guessing about 50-55in/135cm. Those are just estimates, could be more or less depending on how long you want the finished bracelet and how long for ties.
My standard string measurements for most patterns are the full length of my arm to the center of my chest, then I make adjustments from there. I also started keeping a notebook of how long I cut my strings for each pattern and color, then compare how many knots in the pattern to how much string I have left (or run out of) so I can make better guesses for future bracelets 😊