There is no unified standard for the replacement cycle of toner cartridges, which mainly depends on the number of printed pages, quality prompts, types of consumables, and maintenance conditions.

Core judgment criteria
Printing page count: The lifespan of a standard toner cartridge is generally between 2000-5000 pages, and high-capacity models can reach over 10000 pages. When the printer screen or driver prompts for replacement, immediate action is required.
Decreased printing quality: The appearance of lighter handwriting, missing prints, black spots or stripes indicates that the toner cartridge has reached the end of its lifespan.
Differences in consumable types
Integrated toner cartridge: When the toner is depleted, it needs to be replaced as a whole and does not support repeated toner addition (forced toner addition may damage the printer).
Drum powder separation/powder addition:
The toner cartridge can be replaced separately, and the photosensitive drum has a longer lifespan (usually 10000-20000 pages);
When adding toner, it is recommended to replace the toner cartridge as a whole after adding toner 2-3 times to avoid printing problems caused by aging of internal components;
For example, the photosensitive drum of the HP 1005w series has a lifespan of 20000 pages and can be powdered 8 times.
Maintenance and Storage
Shelf life: The unopened toner cartridge has a shelf life of 24-36 months, and only 6 months after opening (it needs to be stored in a cool, electromagnetic interference free environment).
Waste powder cleaning: When adding powder, it is necessary to thoroughly clean the waste powder bin to avoid affecting the service life of the photosensitive drum.
Usage frequency reference
High frequency use (such as office): replace every 3-6 months;
Low frequency use (such as at home): replace every 12-18 months;
Ultimately, it is necessary to make a comprehensive judgment based on the actual printing volume and quality.
It is recommended to monitor the status in real-time through a toner cartridge life detection tool or printer self-test function, and prioritize the use of original or high compatibility consumables (such as HP 88X toner cartridges) to extend their lifespan.