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For Chinese black teas, you can go ahead and fill the gaiwan with a generous dose of tea, filling the vessel about 1/4 full. Rinse the tea and dump the water, then refill with water and steep for 1 to 2 minutes. These teas can be reinfused up to two or even more times if the tea is particularly young, with your time parameters being adjusted to taste. For the other black teas, a smaller dose and longer steeping time are generally warranted.
If the water is too hot or if the tea has been steeped for too long, it can impart bitterness. If the water is too cool, the full flavor of the tea won't be properly extracted. The ideal steeping time varies according to the size and shape of the leaves, the grade of the tea, and when the tea was harvested. Green tea is generally heated to 140 to 185 F and is brewed for one to three minutes. Several studies suggest that the brewing method can alter the catechin content of a cup of tea.