What’s the approximate delay between real blockchain data and API-provided data ?

Hi everyone,

I’m working on a project related to the Ethereum blockchain, and I’m particularly curious about the data provided by APIs like Etherscan (e.g., token transfers, block numbers, balances, etc.).

I’m wondering what the approximate delay is between:

1. The real-time data on the blockchain (e.g., when a block is validated).
2. The data accessible through public APIs like Etherscan’s.