user91626: I know how to check when a specific transaction was included in the block. But how do I check when my bitcoind node first saw it? I would like to estimate for how long the transaction stayed unconfirmed after it was broadcasted.

user24925: The getrawmempool interface provides this information in the time field, though it is potentially very slow to respond with a large number of transactions in the mempool. It does not record this time once the transaction is removed from the mempool for non-wallet transactions, so it either needs to be gathered from this interface or recorded on addition with the zmq socket. 
"result": {
    "89ee39117b4b55e54ace29c631eef80a875ae109a4fbd79ddd10b6f21329e88d": {
        "size": 225,
        "fee": 0.00000573,
        "modifiedfee": 0.00000573,
        "time": 1556802637,
        "height": 574268,
        "descendantcount": 2,
        "descendantsize": 451,
        "descendantfees": 3247,
        "ancestorcount": 1,
        "ancestorsize": 225,
        "ancestorfees": 573,
        "wtxid": "89ee39117b4b55e54ace29c631eef80a875ae109a4fbd79ddd10b6f21329e88d",
        "depends": [

        ]
    }
}


91626: <p>I know how to check when a specific transaction was included in the block. But how do I check when my <code>bitcoind</code> node first saw it? I would like to estimate for how long the transaction stayed unconfirmed after it was broadcasted.</p>
 24925: <p>The <code>getrawmempool</code> interface provides this information in the <code>time</code> field, though it is potentially very slow to respond with a large number of transactions in the mempool. It does not record this time once the transaction is removed from the mempool for non-wallet transactions, so it either needs to be gathered from this interface or recorded on addition with the <code>zmq</code> socket. </p>

<pre><code>"result": {
    "89ee39117b4b55e54ace29c631eef80a875ae109a4fbd79ddd10b6f21329e88d": {
        "size": 225,
        "fee": 0.00000573,
        "modifiedfee": 0.00000573,
        "time": 1556802637,
        "height": 574268,
        "descendantcount": 2,
        "descendantsize": 451,
        "descendantfees": 3247,
        "ancestorcount": 1,
        "ancestorsize": 225,
        "ancestorfees": 573,
        "wtxid": "89ee39117b4b55e54ace29c631eef80a875ae109a4fbd79ddd10b6f21329e88d",
        "depends": [

        ]
    }
}
</code></pre>
