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The configuration that defines the length of an epoch in slots and governs how epoch boundaries are calculated on a Solana cluster. On mainnet-beta, each epoch is 432,000 slots (approximately 2-3 days at 400ms per slot). The epoch schedule determines when staking rewards are distributed, when stake activations and deactivations take effect, and when the leader schedule is recalculated. It is set at genesis and queryable via the getEpochSchedule RPC method.