How long does it take for caffeine to wear off?!


Question:

How long does it take for caffeine to wear off?

How long does it take for a can of soda's worth of caffeine to wear off?


Answers:

How long does it generally take from the time of caffeine ingestion for one to benefit from its mental alertness side-effect and also for the caffeine's effect to wear off in this respect?
A: Caffeine concentrations in the blood peak somewhere between 15 and 120 minutes and the half life (the time taken to halve the concentration) of caffeine is between 2.5 and 4.5 hours.


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