The amount of time required to boil kale will depend on a few factors such as the type of kale, the quantity of kale, and personal preference.

As a general guideline, to boil kale, fill a large pot with water and bring it to a rolling boil. Add the washed and chopped kale leaves to the boiling water and cook for 5-10 minutes, or until the leaves are tender but still bright green.

However, some people prefer to cook kale for longer periods of time to make it more tender, while others prefer a bit of a crunch and will only boil for a few minutes. It's important to taste the kale periodically while cooking to achieve the desired texture.

Note that overcooking kale can cause it to become mushy and lose some of its nutrients, so be careful not to boil it for too long.