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I used to drink a lot of coffee but as I got older I find that I enjoy tea more. For everything you ever wanted to know about tea, coffee and alcoholic drinks I can recommend a splendid book on the subject. "Buzz : the science and lore of alcohol and caffeine" by Stephen Braun. Penguin Books, 1997. It answers many questions that were asked in this thread.
There is no standard measure for caffeine in drinks like for alcohol, but "the most commonly used unit is the 100 milligrams of caffeine found in an average (8-ounce) cup of regular coffee...two cups of black tea"
As to the duration of the effects of caffeine, the time it takes for half a dose to be eliminated from the body is called the "half-life" and the half-life of caffeine averages between five and six hours.
However, curiously, "women taking oral contraceptives require about twice the normal time to eliminate caffeine. For such women, the stimulation from a single cup of coffee might last all day. A similar, though less dramatic increase in caffeine's half-life has been reported for women during the luteal phase of the menstrual cycle - the time between ovulation and the beginning of menstruation." This would explain why some women are more sensitive to its effects.
As to mixing tea and coffee, apparently it is a standard item in Hong Kong coffee shops. One can go into a coffee shop in Hong Kong and order a "coffee-tea". Those who drink the stuff say that they love it because they can taste the two flavours separately at the same time!
By the way Zelda, have you tried Twining's Lady Grey tea? It is available in France and subtitled Earl Grey russe. This is one of my favourites.
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