How long does the drum unit last on the HL-B2080DW?
The drum unit has an approximate life of 12,000 pages based on 1 page per job using A4/Letter simplex pages. The applicable drum unit model is DR-B021 (for India) or DR-B022 (for Indonesia and Vietnam), and the actual number of pages may vary depending on media type and size. (Page 11)
From the official Brother HL-B2080DW Monochrome Laser Printer manual, page 12
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