Several centuries
It is called Centenary.
It is called a "centennial celebration"
A three-hundred-year celebration is called a tricentennial.
bicentennial
He painted about several hundred paintings of dancers on the stage, from 1870 onwards. One of the best known is called L'étoile (the Star), painted in 1878.
A one-hundred-year-old person can be called a Centenarian.
A period of 100 years is a century
The Spartans were at war every few years for several hundred years.
There have been several, one was called the Hundred Years War
The two-hundred-year period in Roman history marked by freedom stability and peace was called the Pax Romana.
a humpback whale
several hundred is more than 200 but less than 1000