Like a flour mill? Or coarse like a grist mill?
If you want a flour mill, even set coarse it will take a long time to grind
feed. But a days feed isn't much more than a large batch of bread, so The test times
should be about right if you look at the
online reviews. The good ones are easy to adapt to a motor OR BICYCLE. Pedal power is a good intermediate step, especially if you are off grid. Electric mills are WAY faster, but most only do fine to extra fine. No way to get grits or coarser out of any electric mill I have seen.
Small grist mills are reasonable on eBay or antique shops and are faster, but not that usable for the house other than grits or
coffee.
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