This question already has an answer here:
In case of Bitcoin, it is 10 min.
What is the case for ETH or ERC20 based token? And what's the confirmation time change after Casper update?
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marked as duplicate by carver, Richard Horrocks, Ismael, eth♦ Sep 8 '17 at 6:10
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
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I voted to keep this open; the first part of this question is different from the linked post. The second question, though, becomes redundant after the first is answered. – lungj Sep 6 '17 at 2:09
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An ERC20 token is just an Ethereum smart contract. Any operation with tokens is a transaction which must be confirmed by the Ethereum network, just as any other transaction. Assuming that the fee is sufficient and the network is not overloaded (which sometimes happens during large ICOs), transactions are confirmed within a minute (an average block time at time of writing is ~24 seconds).
