What is the maximum print speed for A4 and Letter size papers?
The printer can print up to 18 pages per minute (ppm) on A4 size paper and 20 ppm on Letter size paper. This varies slightly depending on the model, with certain models reaching 21 ppm on Letter size paper. (Page 6)
From the official HP Laserjet Pro Mfp M28 M31 Printer manual, page 6
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