To be honest Ruth, does it really matter?
Yes it does if you are looking at selling pens and then time is money.
If its a hobby then I would ask does it really matters.?
If tge question is to help understand if you are doing it right, then yes you are doing it right.
But the most important thing is that the quality is right.
Tge quality of your pens will sell your pens, not how quick you make them. However if you can sell them then you will need to make them quicker, maintain the quality and then make money.
But as others have said, setting everything out and planning ahead then you can become a production line, but is that what you want?