How long is brewed coffee fresh for and what does that blinking light mean at Starbucks? I asked a Starbucks barista what the blinking light is for on the brewed coffee and he said is starts blinking 15 minutes after the coffee is brewed.

This makes no sense to me as they would have to brew coffee 4 times an hour which they obviously do not do because it would be ludicrous.
The blinking light means it has been sitting there for 30 mins.

Starbucks Baristas do in fact brew coffee every 15 mins and are supposed to dump the coffee when the light blinks.

source: a starbucks barista