tisanes

It seems like you are highlighting tisanes, which can pretty much be brewed forever.

Kukicha (though it still has some caffeine), hojicha, rooibos, various other tisanes.

These are generally known as herbal infusions or tisanes, and not tea.

There is nothing wrong with tisanes, but they are not tea.

Just an FYI in case people don't know, tea often has plenty of caffeine in it, and many tisanes/blends/etc will have sugar in them as well.

There's always tisanes like rooibos and herbs (mint, etc).

PG Tips, Uncle Lee's green, tisanes of all descriptions.

There are some naturally caffeine free tisanes - I'd suggest rooibos or honeybush.

I drank tea and tisanes with sugar and milk when I was young.

Even most tisanes are sweetened as much as not.

A reference to the incident may be heard in Scott Pilgrim vs The World, when Mona Flowers lists off what kinds of tea (and tisanes) she has.

I love tisanes, what are informally called herbal teas.

It wasn't long ago that Celestial Seasonings was caught adulterating their concoctions (technically, "tisanes") with toxic ingredients.

Any "teas" that are not of the camellia sinensis plant are technically called tisanes, although in colloquial usage no one says tisane.

Tisanes, which we in the US like to call "herbal teas" are any number of plant infusions not made from camellia sinensis.

I don't know about the biological definition of "herbal" but in practice herbal is used as a catch-all for tisanes, teas that are made without the Camellia sinensis (tea) plant.

Tisanes are and were popular before coffee and teas spread.