In a hydrogen atom, the electron's position is not fixed. Instead, it occupies a three-dimensional region of space called an orbital. The electron moves continuously within this orbital, and the speed at which it moves depends on its energy level.

The lowest energy level, called the ground state, has the slowest electron speed. As the electron moves to higher energy levels, its speed increases. The highest energy level, called the ionization limit, has the fastest electron speed.

The average speed of an electron in the ground state of a hydrogen atom is about 2.2 x 10^6 meters per second. This means that the electron changes position about 2.2 million times per second.

As the electron moves to higher energy levels, its speed increases. For example, the average speed of an electron in the second energy level is about 4.4 x 10^6 meters per second. This means that the electron changes position about 4.4 million times per second.

At the ionization limit, the electron's speed is about 2.2 x 10^7 meters per second. This means that the electron changes position about 22 million times per second.

So, the number of times a hydrogen electron changes position each second depends on its energy level. The higher the energy level, the faster the electron moves and the more times it changes position.