I have never seen pinto beans spoil in less than a period of about two hours however in my years of cooking you would have to leave them out of the refrigerator for several hours before they would began to spoil.
Beans are a staple food in the South and they would have to stay out all night in some cases before spoilage would sat in however If I intended on selling the beans to the public I would follow the 2 HOUR RULE and just cook a fresh pot.
germination pinto bean plant
Cooked beans should be used within 2-3 days.
Soak pinto beans in water overnight for at least 8 hours before cooking them.
If you store the beans in an air tight container, they can stay good for years. Dried beans are a good staple to have in your diet. Keep them dry until ready to cook.
A
Soaking them too long, probably.
If kept in a water tight container up to a year.
Cooked pinto beans can spoil or sour if not stored properly. If left at room temperature for too long, they can develop harmful bacteria, leading to an off smell or taste. To prevent this, store cooked beans in an airtight container in the refrigerator, where they can last for about 3 to 5 days. Always check for signs of spoilage before consuming.
Cooked pinto beans are considered potentially hazardous. They should not be left unrefrigerated for more than 2 hours.
Several months if kept in the freezer
Soaking pinto beans before you cook them speeds up cookign time and allows some of the gas to escape. When soaking beans the water should be change the water several time, or when it begins to turn dark.
After quick internet search I found cooked beans will last up to a week, refrigerated.