In Cardano, time is split up into Epochs where each Epoch is 5 days in duration. The following timeline dictates how long it will take to start earning rewards on your stake.

Assuming you registered and delegated at epoch N:

At Epoch N + 1, your staking balance is included in a snapshot
- your staking balance is made up of the balance of all Payment Addresses linked to a Registered and Delegated Stake Key
At Epoch N + 2, your stake activates
At Epoch N + 3, your stake begins earning rewards
At Epoch N + 4, your staking rewards are paid to your wallet automatically
After this initial activation period, you will automatically receive staking rewards to your wallet every Epoch

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No disruption to your rewards when changing delegation
The above timeline applies to new staking addresses. For an existing stake that is being re-delegated to Pier Two, there will be no disruption to your rewards.
You will continue to earn rewards from your old validator pool until epoch N+2, and the last payout of rewards from the old pool will occur in epoch N+3.
You will begin earning rewards from Pier Two in N+3 and will be reflected in your automatic rewards payouts from epoch N+4 onwards.