@supeertin_ generally 6 rows is about 1 cm of string so for this pattern itś 14.5cm but you will need more than that for the base strings. I would use a minimum of 20cm for each base string. If you want to make it into a bracelet though, I would make the base strings at least 30 cm each. Now for the white string that will be showing will use a lot, so I would not cut the thread until the end. When you buy the thread, it should be 800cm. I would just use all of the 800cm until the alpha is completed and cut off any excess string at the end.