Robert
Favorite Answer
A guess? Sure. I guess it would depend upon the amount of tea consumed measured with your body mass. So I'll just go with a guess that for an average weight person consuming one cup of green tea with no sugar or other stimulant added, the tranquil feeling would last for 22 minutes or until they were aggravated by being asked a stupid question.
StarShine
Green tea (unless specifically decaffeinated) contains caffeine. I would think for most people, it would have the opposite of a sedative effect.