You make it look so easy

Oh boy, I haven't seen one of those since high school. I guess I just told you how old I am. Now it's time to find some twine!

This was the best and easiest video i found to follow so thank you soooo much

I like the simplicity of that macramé, but I don't know the length that it ended up to be. How can I decide the number of meters for a certain length?