<p>As mentioned by Ethan Heilman <a href="https://bitcoin.stackexchange.com/questions/10821/how-long-does-it-take-to-propagate-a-newly-created-block-to-the-entire-bitcoin-n">here</a>:</p>

<blockquote>
  <p>According the paper 'Information propagation in the bitcoin network.' by Decker and Wattenhofer. The mean time for a node to see a block is 12.6 seconds, after 40 seconds 95% of the nodes have seen that block.</p>
</blockquote>

<p><br />
<br />
From my personal experience as a developer, this delay is real and noticeable. Some block explorers catch transactions ~20-30 seconds before others. It may be scary at first but its normal.
<br />
<br /></p>

CC BY-SA 3.0
2018-04-02T18:26:29.317Z
This is unrelated. Transaction relay is deliberately slowed down in order to improve privacy (to hide the source of a transaction, random delays are added). This is not the case for block propagation which is very optimized to be as fast as possible.
Pieter Wuille
CC BY-SA 3.0
2018-04-04T02:06:21.367Z
He asked about propagation times.
Monstrum
CC BY-SA 3.0
2018-04-04T02:22:57.673Z
I assume he means propagation time of blocks. Transaction relay time is not relevant for network convergance. But you're right, it is a guess.
Pieter Wuille
CC BY-SA 3.0
2017-11-28T16:04:45.430Z
2017-11-28T16:04:45.430Z
Monstrum
<p>Is there a certain website or a study that gives an estimation for the 
ratio <em>f = Propagation Delay/Block Interval</em> for the Bitcoin network ?
I know the <em>Block Interval</em> is roughly 10 minutes however, I don't know the propagation delay. I define it as the time it takes for all nodes to hear  about a mined block after it's been broadcast.</p>

CC BY-SA 3.0
2017-11-28T12:59:14.540Z
Probably related: https://bitcoin.stackexchange.com/q/10821/31712
Sergei Tikhomirov
<blockchain><mining-theory>
The ratio between propagation delay and block interval
SpiderRico
# The ratio between propagation delay and block interval

(Asked by: username_0 on 2017-11-28)

Is there a certain website or a study that gives an estimation for the
ratio *f = Propagation Delay/Block Interval* for the Bitcoin network ?
I know the *Block Interval* is roughly 10 minutes however, I don't know the propagation delay. I define it as the time it takes for all nodes to hear about a mined block after it's been broadcast.

**Tags:** blockchain, mining-theory

> **Comments:**
> **username_1**: Probably related: https://bitcoin.stackexchange.com/q/10821/31712  

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## 1 answers

### Answer by username_2 on 2017-11-28. Score: 0 | Accepted answer

As mentioned by Ethan Heilman [here](https://bitcoin.stackexchange.com/questions/10821/how-long-does-it-take-to-propagate-a-newly-created-block-to-the-entire-bitcoin-n):

> According the paper 'Information propagation in the bitcoin network.' by Decker and Wattenhofer. The mean time for a node to see a block is 12.6 seconds, after 40 seconds 95% of the nodes have seen that block.

From my personal experience as a developer, this delay is real and noticeable. Some block explorers catch transactions ~20-30 seconds before others. It may be scary at first but its normal.

> **Comments:**
> **username_3**: This is unrelated. Transaction relay is deliberately slowed down in order to improve privacy (to hide the source of a transaction, random delays are added). This is not the case for block propagation which is very optimized to be as fast as possible.  
> **username_2**: He asked about propagation times.  
> **username_3**: I assume he means propagation time of blocks. Transaction relay time is not relevant for network convergance. But you're right, it is a guess.  

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