I have not made enough shell discs to be confident in the speed of the final practice .It takes a while to get fast. This little strand probably took three hours but much of that was trying to dial in the shell production.We have nothing but extremely high tides in the daytime where I live until the first of the year when it will again be possible to collect shells and make a concerted effort to learn how to produce these efficiently.They are strangely gratifying to make.