Everything tends to start breaking down immediately. However, tea is boiled... so it is not exactly a fresh enzyme source.
One thing you can do to improve the value: drink the tea straight, and eat the honey raw. Raw honey kills every kind of fungus and bacteria (Napoleon used sugar to treat wounds).
Fungus growing in the stomach is a major source of illness and lack of energy in Americans, and globally.
back to tea... I keep tea in the 'fridge for many days. It is still refreshing after a week.