Hand Drawn Symbol Scale

I have read the TouM regarding raster scale and I believe I am comfortable with the method there, my real question is for hand drawn symbols that will be scanned in, what would a decent physical size be for a 200*200 image at scale 1. I.e 10 miles in overland.

I realize its all relevant an many physical scales can be adjusted and scanned ppi is a factor etc, I am just looking for a decent average. 2" square ? 1" ? And at what ppi scan setting.

Any help would be appreciated,
Bill

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