How long does the drum unit last on the DCP-B7520DW?
The drum unit model DR-B023 has an approximate life of 12,000 pages based on 1 page per job using A4/Letter simplex pages. The actual number of pages may be affected by factors including media type and media size. (Page 15)
From the official Brother DCP Series B7520DW All-in-One Printer manual, page 15
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