One epoch in the Flow network lasts approximately 7 days. An epoch is a period of time the network uses to manage the list of registered validator nodes and staking rewards payouts.
During the staking auction phase, delegators can register to undelegate their FLOW. Any attempt to send staking transactions during the setup & commit phase will be rejected. This is because this is the period of time that the network is preparing for the next epoch, and requires for the staking information to be constant. All staking operations will be executed during the Epoch switchover - the point of time when one epoch ends and the next begins.
Therefore, for your stake to undelegate, it will take approximately 1-7 days depending on when in the epoch you sent out the request to undelegate. At the end of the epoch, you will receive your last set of rewards and your FLOW will be available to withdraw.
For more information on staking Flow (FLOW) with P2P Validator visit https://p2p.org/flow.
For additional staking support, visit the P2P Flow staking support
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