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This question already has an answer here:

Is there a conflict as to when the halving will occur and Bitcoin miner rewards become 12.5? Is is set in stone to happen this July or is it after a certain amount of blocks?

marked as duplicate by Jestin, Pieter Wuille, Community Jun 30 '16 at 5:05

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It is exactly at block 420000.

When block 420000 will be mined is not certain, as the block mining process is random and influenced by hashrate variation.

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