Your body is making over 3.8 million new cells every second!
According to biologists Ron Sender and Ron Milo of the Weizmann Institute of Science in Israel, your body replaces around 330 billion cells per day. At that rate, your body is making over 3.8 million new cells every second.
https://www.sciencealert.com/your-body-makes-4-million-cells-a-second-and-most-of-them-are-blood