Jet engines don't spin in the traditional sense like a spinning top. They have a rotating shaft called the rotor, which is made up of multiple sections:

* Low-pressure compressor: This section spins relatively slowly, usually around 10,000 to 15,000 RPM (revolutions per minute).

* High-pressure compressor: This section spins much faster, typically around 20,000 to 30,000 RPM.

* Turbine: This section is directly connected to the compressor sections and spins at the same speed.

So, the speed of a jet engine's rotor varies depending on the section you're talking about. The high-pressure compressor and turbine are the fastest, spinning at 20,000 to 30,000 RPM, while the low-pressure compressor spins at a slower 10,000 to 15,000 RPM.

It's important to note that these are just approximate ranges, and the actual speed can vary greatly depending on the specific engine design, operating conditions, and power settings.