All Matcha trades are sent to their respective blockchain for settlement. For example, on Ethereum, the time it takes for an Ethereum transaction to complete will depend on the amount of gas paid and how congested the Ethereum network is.
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On average, most Matcha trades process within 30 seconds. However, if the Blockchain network is highly congested, a trade may take a few minutes to process.

Learn about Blockchain transactions and time here.