Blockchain Difficulty Level and Growth Rate

This section describes the blockchain difficulty level and the growth rate.

How it long will take the "geth" miner to finish mining a new block? The answer depends on 3 factors:

• The difficulty level set by the blockchain.
• The speed of the computer that runs the "geth" miner.
• The luck of the "geth" miner.

Here are log entries that show how long it took for my "geth" miner to finish mining each new block for the first part of my blockchain. The miner was running with 1 thread on a 2.30 GHz computer and blockchain difficult level is 10000000:

```[12:42:09] Commit new mining work          number=1 txs=0 uncles=0
[12:43:18] Successfully sealed new block   number=1 hash=1e73ae…5d5163
[12:43:18] mined potential block           number=1 hash=1e73ae…5d5163

[12:43:18] Commit new mining work          number=2 txs=0 uncles=0
[12:48:23] Successfully sealed new block   number=2 hash=56ced2…2c1765
[12:48:23] mined potential block           number=2 hash=56ced2…2c1765

[12:48:23] Commit new mining work          number=3 txs=0 uncles=0
[12:48:39] Successfully sealed new block   number=3 hash=1295dc…d9f0cb
[12:48:39] mined potential block           number=3 hash=1295dc…d9f0cb

[12:48:39] Commit new mining work          number=4 txs=0 uncles=0
[12:50:15] Successfully sealed new block   number=4 hash=a1aa74…079064
[12:50:15] mined potential block           number=4 hash=a1aa74…079064

[12:50:15] Commit new mining work          number=5 txs=0 uncles=0
[12:50:36] Successfully sealed new block   number=5 hash=755861…c45492
[12:50:36] mined potential block           number=5 hash=755861…c45492

[12:50:36] Commit new mining work          number=6 txs=0 uncles=0
[12:55:30] Successfully sealed new block   number=6 hash=7e09c7…b63bed
[12:55:30] block reached canonical chain   number=1 hash=1e73ae…5d5163
[12:55:30] mined potential block           number=6 hash=7e09c7…b63bed

[12:55:30] Commit new mining work          number=7 txs=0 uncles=0
[12:58:51] Successfully sealed new block   number=7 hash=ab8263…a0533c
[12:58:51] block reached canonical chain   number=2 hash=56ced2…2c1765
[12:58:51] mined potential block           number=7 hash=ab8263…a0533c
...
```

So 7 blocks were mined within 17 minutes. The average time to finish mining a new block is about 2.4 minutes.