3. If a tea bag has 50mg of caffeine and I brew a cup of tea with it am I getting a...

If a tea bag has 50mg of caffeine and I brew a cup of tea with it am I getting all 50mg even though I could brew a second cup with the same used bag?

This paper looks at caffeine extraction over time. Apparently it takes at least 5 minutes to usually extract all the tea. So if you steep your first bag for 1 minute, drink it, then steep another cup for 1 minute, the second cup will almost certainly have caffeine, but not as much as the first.

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