**You should be able to create a disk and give it a texture and alpha map to simulate blur, then you will only need to rotate a small amount.  Mabye 8 or ten turns per minute.   I cannot imagine asking the render engine to make a thousand rpm's.  With a good blur it will look realistic as when you are looking at a spinning prop you cannot actually see a thousand rpm.   Usually the blade looks like it is slowly turning.

**

Free men do not ask permission to bear arms!!