A tablespoon is a non-scientific but very widely used unit of volume, which works very well in cooking, herbal medicine, etc. It is represented by a capacity of one tablespoon which varies from roughly 15 mL in the US to 20 mL in Australia.
1 If tea is properly stored, it can potentially last up to a year for green and black teas. White tea lasts about six months before it isn't as good in quality as when fresher. Stale tea (or bad tea) will taste flat, as if you're drinking paper.  Glass or ceramic containers are fine provided that they're opaque.
Even if it become thicker, darker or even crystallizes it is still good to eat. Tea. Whether itâs packaged or loose, tea will last anywhere from 6 months to a year past the expiration date. Spices. Most spices last 2-3 years past their expiration date.