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In page Printing press:

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In the middle of the 19th century, there was a separate development of jobbing presses, small presses capable of printing small-format pieces such as billheads, letterheads, business cards, and envelopes. Jobbing presses were capable of quick setup, with an average setup time for a small job was under 15 minutes, and quick production. Even on treadle-powered jobbing presses it was considered normal to get 1,000 impressions per hour [iph] with one pressman, with speeds of 1,500 iph often attained on simple envelope work.[citation needed] Job printing emerged as a reasonably cost-effective duplicating solution for commerce at this time.