1

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.

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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