8-12 days
 
Facts:
Kale is known for it's many health benefits. A few of them include:
The metabolites from the glucosinolates contained in kale induce detoxification enzymes, which help fight cancer.
Full of antioxidants, including beta-carotene, vitamin C, polyphenols and flavonoids. These help against oxidative damage.
High levels of vitamin C, which specifically improves the immune system and help bones stay strong.