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This question already has an answer here:

how come average block time is growing this much latley? In March it was around 14.5 and today is around 24. I know that hash rate is growing fast, but shouldn't every difficulty adjustment reset avg. block time to around 14-15?

Thnx, Tomo

marked as duplicate by Ismael, eth Sep 14 '17 at 1:58

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This is due to the Ethereum 'Ice Age' - an incentive implemented in the code to switch from the current Proof of Work consensus mechanism to a Proof of Stake consensus mechanism or as Vitalik puts it to "prevent protocol stagnation".

From a Tweet Vitalk made: enter image description here

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