re: 25 lbs of peanuts how long and how much salt?

Salt is a personal taste thing. Start with 1 Cup of Salt/Crab boil per 5 pounds of peanuts and go from there. The water will/needs to be very salty for my personal taste. How long? Boil/simmer for a time and begin tasting until you get the desired doneness you want. My preference is soft but still have a slight resistance to the tooth. Time can vary based on how hard you boil them, maturity of the nuts etc. After cooking I allow them to soak over night. This is when the flavor of the salt/crab boil etc enters the hull. You may consider boiling a small batch first...then make any adjustments for the rest off them. HTH