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I know it takes about 10 minutes on Bitcoin?

How long does it take to reach consensus on Ethereum so that I can start trusting a transaction?

EDIT:

  • I am not asking about pending transactions. Pending would indicate that the transaction is in some unconfirmed state (non trustworthy). I want to know about fully confirmed transactions. Thanks.
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  • maybe it can help you : ethereum.stackexchange.com/questions/5699/… – Gawey Jul 12 '17 at 14:15
  • Hi, that is not helpful I think as it refers to pending transactions. – jim Jul 12 '17 at 14:20
  • If you're looking for details on the block time (i.e. the amount of time to mine one block, containing a given number of transactions), see ethereum.stackexchange.com/questions/58/… – Richard Horrocks Jul 12 '17 at 14:25
  • I disagree with this question being marked as a duplicate. He's asking about block confirmation time in addition to the number of blocks. The other question's answers only discuss the number of blocks, not the time. – user9402 Jul 13 '17 at 15:55
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Check out https://ethstats.net/, it's a great quick reference for block times.
As of writing, the average block time is about 20.18 seconds.

That is, a block is confirmed approximately every 20.18 seconds.

You probably only need one confirmation, so that is the required amount of time to trust the transaction. But you can always wait for more successive blocks to be confirmed just to be certain, in which case just multiply the average time by the desired number of blocks.

For more on the number of confirmations needed to trust a transaction, check out https://bitcoin.stackexchange.com/questions/8360/how-many-confirmations-do-i-need-to-ensure-a-transaction-is-successful

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