We shed a million skin cells a day

The process called Apoptosis, is when the body routinely kills off and replaces damaged or used-up cells, sloughing off dead skin, at a rate of perhaps a million cells a day.

We lose between 30,000 and 40,000 skin cells every hour.

In one year, you’ll shed more than 8 pounds (3.6 kilograms) of dead skin. 

Most household dust is made of dead skin cells, of which a lot is devoured by dust mites.

https://health.howstuffworks.com/skin-care/information/anatomy/shed-skin-cells.htm