How often do you change jobs?

For example, I change jobs every 2 years. in a year I can completely learn a profession from scratch, and in another year to develop it to the maximum and understand whether I want to further develop in it or change it. but when I came to the company to work on this project I realized that I want to further develop within the company and I have been working here for 3.5 years. that's it. everyone is different!