2

Ive seen some conflicting answers saying 64 blocks or 60 blocks
thanks

3

The right answer is 60 at the moment, as answered in:

Max lifetime of transactions in mempool?

This value is set by the protocol-dependent constant max_operations_ttl in:

https://gitlab.com/tezos/tezos/-/blob/master/src/proto_alpha/lib_protocol/alpha_context.ml#L261

Thus, it can eventually change on future versions of the protocol.

Notice also that 60 is an upper bound: the current implementation of the mempool performs a recycling process each time the node changes its head, and incompatible operations are discarded.

EDIT: This reply is outdated, as the adoption of the Granada protocol changed max_operation_ttl to 120 blocks. However, notice that given the halving of the minimal time within blocks from 60 to 30 seconds, the window still has a similar length, when measured in human time units, i.e. ~1h.

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