What is the radius of a VOR compass rose on a VFR sectional chart? I thought I read somewhere that it was 10 nautical miles. Does anyone have a reference on whether that's the case or not?

I'd like to use the measurement of a compass rose to aid in my estimation of how far away I might be from something else.
I measured one on a sectional and it came out to approximately 19.4 NM. However, as mentioned, I'm not sure it has a fixed size. Symbols on a map can be resized by the cartographers (map makers) for ease of reading. I would not rely on this for anything other than trivia.