> "The overall average caffeine released in the first through third
> brews were 69%, 23%, and 8%, respectively." Though it doesn't say so
> in the abstract available at the link above, in the full article it is
> said that the infusions were 5 minutes each. So... if 5 minutes
> removes 69%, how much do you really think 30 seconds will?

good point. If they used bagged tea that means that even less will be
released in loose leaf in the same period.