<p>You're trying to do 100% of the work with 70% of the workforce.</p>
<p>The expected block interval is to the target interval of 10 minutes as the total work is to the workforce:</p>
<blockquote>
<p>T<sub>exp</sub> = 10 minutes  × (100% ÷ 70%) = 14.3 minutes</p>
</blockquote>
<p>The difficulty reset would get extended by the same factor:</p>
<blockquote>
<p>D<sub>reset</sub> = 14 days × 100 ÷ 70  = 20 days</p>
</blockquote>
<p>The expected block interval would be about 14.3 minutes for twenty days.</p>

CC BY-SA 4.0
2021-02-13T14:20:09.180Z
2021-02-24T01:13:16.467Z
2021-02-24T01:13:16.467Z
Murch
<p>Ignoring the economic reasons as to why this may or may not happen.  If for some reason the network hashrate suddenly dropped by 30% immediately after a difficulty adjustment and remained at that level until the next difficulty adjustment, how long would each block be expected to take to mine until the next difficulty adjustment.</p>

<mining-theory><difficulty>
What would the expected block mining time be if 30% of the total network hashrate disappeared suddenly?
Miner
# What would the expected block mining time be if 30% of the total network hashrate disappeared suddenly?

(Asked by: username_0 on 2021-02-13)

Ignoring the economic reasons as to why this may or may not happen. If for some reason the network hashrate suddenly dropped by 30% immediately after a difficulty adjustment and remained at that level until the next difficulty adjustment, how long would each block be expected to take to mine until the next difficulty adjustment.

**Tags:** mining-theory, difficulty


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## 1 answers

### Answer by username_1 on 2021-02-13. Score: 2

You're trying to do 100% of the work with 70% of the workforce.

The expected block interval is to the target interval of 10 minutes as the total work is to the workforce:

> Texp = 10 minutes × (100% ÷ 70%) = 14.3 minutes

The difficulty reset would get extended by the same factor:

> Dreset = 14 days × 100 ÷ 70 = 20 days

The expected block interval would be about 14.3 minutes for twenty days.


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