How long did the epoch last before our era?

If we take scientific terminology, then the last was the Holocene era, which began 11,700 years ago, that is, 9,700 years BC. If we take the Biblical period, then from the creation of the world to our era, about 5500 years have passed. In general, the history of mankind is a very mysterious sphere, which is covered with many secrets. One such mystery is ancient civilizations that may have existed long before the official historical framework.