How long did God's punishment th darkness for the Isrealites?

God's punishment of darkness for the Israelites lasted three days, as described in the biblical account of the plagues in Egypt, specifically in Exodus 10:21-23. During this time, the land was engulfed in thick darkness that could be felt, while the Israelites had light in their dwellings. This plague was one of the final signs before the Israelites were freed from slavery.