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.
4. Brewing iced tea at an appropriate temperature in a thoroughly cleaned urn and limiting the time held at room temperature before serving will minimize the theoretical risk of bacterial contamination. Recommendations for Iced Tea Safety. * Iced tea sould be brewed at 195 F for 3-5 minutes.* Iced tea should be stored for no longer than 8 hours. * The tea brewer, storage dispenser, and faucet should be cleaned daily.The CDC stated that redesigning tea dispensers to be more easily dismantled and cleaned could further reduce the theoretical risk of bacterial contamination of iced tea. Iced tea should be stored for no longer than 8 hours. * The tea brewer, storage dispenser, and faucet should be cleaned daily. The CDC stated that redesigning tea dispensers to be more easily dismantled and cleaned could further reduce the theoretical risk of bacterial contamination of iced tea.