Britannica Sources used in this answer

Precambrian - Worldwide glaciations

How long did the Gaskiers glaciation last?

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A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years. — Precambrian The stratigraphic chart of geologic time.

The Gaskiers glaciation was a relatively brief event that lasted approximately 340,000 years, occurring about 580 million years ago during the late Proterozoic Eon.1