How many times can you reuse jasmine tea grounds (the real stuff from China) before the caffeine is gone?

Question

I want to make sure it's still waking me up.

Answer 1

I would be more concerned with the lack of flavor.

Answer 2

I'd say 2 times. Normally people discard the first brewing due to highest caffeine content and drink the 2nd, which is lower. I've read that something like 95% of the caffeine content is in the 1st brew, 5% in the 2nd, 2% in the 3rd, and so on.