How long did the revolution last in animal farm?

In George Orwell's "Animal Farm," the revolution begins when the animals overthrow their human owner, Mr. Jones, which occurs in the early chapters of the book. The revolution effectively lasts until the pigs, who lead the rebellion, become indistinguishable from the oppressive humans they replaced. This transformation culminates in the final chapters, suggesting that the revolution's ideals were corrupted rather than truly realized. Overall, the timeline of the revolution spans several years within the narrative, but the focus is on the change in power dynamics rather than a specific duration.