I am looking for information on the time it took for the construction and binding of books in particular, not the writing or copying of them.
So, considering that the material is ready to be bound, and that the book to be made is fairly plain and functional (e.g. as wiki says "bound in plain white vellum over boards, and had a brief title hand-written on the spine"):
How long would this process take for someone who was skilled at it (i.e. it was their job) per book?
How much longer would a luxury book (decorated cover, metal furniture, etc) take compared with this plain book?
If more than one book was needing to be constructed, could time be saved (either in preparation of the materials or the binding process itself) by grouping tasks, or would they need to be bound one by one?