In most cases around 7-8 minutes is the standard block time (called Checkpoint), but it might take a bit more if the Ethereum mainnet is congested. Transferring back funds from Matic to mainnet Ethereum might take from 10-30 minutes on the PoS bridge, to 7 days (also known as a Challenge Period) on the Plasma bridge. You can check with the developer of the DApp you are using what their default withdrawal mechanism is.
Last updated 16.06.2021
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