You can soak the beans for 24 hours or overnight.
Soaking dried kidney beans
Before soaking, sort through the beans to remove tiny stones or debris.
Place the beans into a container and rinse well with water
Add enough tap water to cover the beans by 2 inches
Cover the container and place in the fridge. To prevent the beans from fermenting, refrigerate them while they soak.
How to soak red kidney beans fast! (quick-soaked method)
When time is of the essence, use this quick-soaked technique, Add the beans in a pot with 2 cups of water, cover and bring to a boil on high heat. Remove from heat and set aside for 1 hour. After an hour had passed, discard the water and rinse the beans with tap water. Although this process saves time, quick-soaked beans tends to break up during cooking. so, if you want the beans to remain whole, use the long-soaked method. Proceed to cook the beans until tender into 2 cups of water and a clove of garlic on high heat.