Are they adding covers to the document or are you just copying booklets?
12 originals for a 3 sheet 8 1/2 x 11r booklet without covers 600 booklets on a KM-8030 approx 6 - 6 1/2 hours the last time I checked.

It's very slow. The KM-8530 (Monica box) does that same job in 2 hours.