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If a transaction sits a long time in the tezos mempool for a reason or another does it get eventually cleaned-up or will it stay there forever ?

2 Answers 2

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In the current protocol there's a time to live of 60 blocks for every manager operation, after which they can no longer be included.

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NB: After the adoption of the Granada protocol, which halves the minimal time between blocks, the max_operation_ttl constant was doubled from 60 to 120 blocks, to roughly preserve the length of the live blocks and operations window when measured in wall-clock time.

NB NB After the activation of the Mumbai protocol upgrade further halved minimal blocktime from 30s to 15s, this constant was consequently doubled, again, from 120 to 240 blocks to preserve the invariant.

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