What is the approximate life of the drum unit?
The DR-B021 or DR-B022 drum unit (depending on your region) has an approximate life of 12,000 pages based on 1 page per job for A4/Letter simplex pages. The actual number of pages may vary depending on factors such as media type and media size.
From the official Brother HL-B2080DW Monochrome Laser Printer manual, page 12
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