Brother DCP-8020 - Manual (Page 277)

SPECIFICATIONS S - 6
Consumable items
Toner Cartridge Life
Expectancy TN-530:
Standard Toner Cartridge - Up to 3,300*
pages
TN-560:
High Yield Toner Cartridge - Up to 6,500* pages
*(when printing letter size or A4 paper at 5% print
coverage)
Toner life expectancy will vary depending upon the
type of average print job.
Drum Unit Life
Expectancy DR-500:
Up to 20,000 pages/drum unit
There are many factors that determine the actual
drum life, such as temperature, humidity, type of
paper, toner you use and number of pages per print
job.