@rudamalpa this is an alpha pattern. For the leading strings I recommend to just leave them on the skein and cut them in the end. For the base strings you need the length of the bracelet plus some extra for ties, loop etc. If you've made an alpha before, you can measure how long a certain amount of rows is in it and then use it to calculate how long this pattern will be for you 🙂
After falling back into friendship bracelets this year, I discovered alpha patterns and this happened to be the first one I made. Learned a lot of things and enjoyed the process so much, I made an account to share my work!