How long does the drum unit last on my HL-L2325DW?
The DR-730 drum unit 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-L2325DW Monochrome Laser Printer manual, page 12
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