A pot of Jade Butterfly.
Different teas require different brewing time and temp.
Black tea - 100°C
You got to brew it for 2-3 minutes if you want it to invigorate you. If you leave black tea for 10 minutes it works backwards, can put you to sleep. It looses it qualities.
Green/white/blue teas vary between 65-75°C
Genmaicha 80°C
and so on.
When I spent 2 weeks in a hotel in Turkey, I was completely hooked on Turkish tea. Black? 2-3 minutes? Ha! There was a whole room dedicated to brewing this tea. 30-40 minutes. Go figure...