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A period of 25 years is called a "quarter-century." This term is derived from the fact that a century is made up of 100 years, so a quarter-century represents a quarter of that time span. It is commonly used in various contexts, such as history, planning, and forecasting.
That's called a millenium.
Well, honey, a quarter of a century is 25 years. So, if you're trying to do the math in your head, just remember that a century is 100 years, and a quarter of that is 25. Easy peasy lemon squeezy!
It COULD be called a Gigayear, but in practice it is simply called "a billion years".
A period of ten years is a decade.