The process is the same as boiling peanuts in a pot on the stove.
Dried raw peanuts will probably take 20 hours or more to soften to your liking when boiled in a crock pot. Green raw peanuts should take about 1 hour to 4 hours.
Salt makes dried peanuts and other dried legumes take longer to soften when boiling, so we suggest you boil them in plain water until the peanuts begin to reach the texture that you like. Add fresh water to the crock pot as needed.
"Taste them early, taste them often" is our motto for boiling peanuts to the best texture.
When the boiled peanuts are almost as soft as you like, add salt to the crock pot. We suggest about 1 tablespoon of salt per pint of water, which is a 1/2 cup of salt per gallon of water. Adjust the amount of salt to your taste, but don't be tempted to add salt before the peanuts have softened, and are becoming wet inside the shells. The salty flavor will not penetrate the peanuts until they have softened, and the flavor increases as the shells fill with brine.
Continue heating the peanuts in the salt water and they will soak up the flavor. This will take more than an hour, to taste. Taste samples at least every 30 minutes until they are done to your liking. Let them soak in the brine as they cool, and the salt water will fill the shells. Refrigerate the boiled peanuts overnight in the brine for maximum juicy flavor.