Normally, how long would the pain from a nettle sting last?

Stinging Nettles.: Pain usually last up to a few hours but the rash & itching can sometimes last several days. Wash the skin with soap & water. Make a paste of baking soda and water (sticky consistency) and spread over the affected area. In a pinch you can spit on the affected area because saliva can neutralize the chemical irritants. In the woods – apply mud to the area. Curly dock can also be rubbed on the area.