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The longer tea steeps, the greater the quantity of health-boosting flavonoids. Here's more proof that bigger isn't always better: Several recent studies show that sometimes the smallest changes (like how you brew your tea or when you schedule a medical exam) can have a huge payoff when it comes to improving your health.
1 So if you're looking for more of a jolt, don't steep the tea for ages, just use more tea leaves.  Unmade tea contains more caffeine than unmade coffee, however when you make the drink lots of caffeine is left in the tea leaves you throw away leaving less in the tea you drink than in coffee.