Least/most permanent rock amount possible?

I got 9 , which is the maximum i think ._. Wish I have fewer...
 
I think I have 6 permanent rock? But they fit perfectly in my town so I have no problem with it =)
 
I have 6 permanents, and 1 ore rock I haven't smashed. Luckily they're not in completely awkward places, so there's that.

A friend of mine was resetting for new towns recently, and she got a town with only 3 rocks. Then after more resets, a town with 13 rocks. o.o;
 
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