How long should a laser toner cartridge last?

How long should a laser toner cartridge last?
The new toner cartridge of a laser printer can print thousands of sheets. The toner cartridge is generally composed of three parts: a photosensitive drum, a magnetic drum, and a toner cartridge. In some laser printers, these three parts are independent and can be replaced separately, but more often the three are combined into one The whole, and many friends will not split it, so can only replace the entire toner cartridge.
When the toner cartridge of the printer is designed, the life of the photosensitive drum and magnetic drum is relatively long, and it does not need to be replaced when the toner in the toner cartridge is exhausted. Under normal circumstances, the toner cartridge that has just been replaced can generally print about 2,000 sheets, while the design life of the photosensitive drum can generally reach about 20,000 sheets. Considering that the toner you replace is a substitute brand, the waste toner rate will be relatively higher. It is higher, so under normal circumstances, the entire toner cartridge needs to be replaced when the toner is added about 5 times.