On average, Reds are around 5-7" after one year, depending on many factors, like stress levels, diet, water quality.
Once they reach about 6-7", their growth slows down considerably, to about an inch per year, and even less when they get around 10" in size.
Their maximum size is 16", although most grow up to some 12".
Another factor not mentioned is the size of the environment that they're housed in. Aside from what Judazzz said, calculating the amount of fish times the size of the tank can help prevent stunth growth, problems, and would help reach close to their maximum size.
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