Generally 10s of seconds to low minutes. Two caveats: 1) we batch/queue writes on the producer side, and 2) our systems are more near-line than true low-latency

Generally 10s of seconds to low minutes. Two caveats: 1) we batch/queue writes on the producer side, and 2) our systems are more near-line than true low-latency, e.g. we scale the cluster up/down instead of keeping machines running to keep latency as low as possible. So YMMV. I'd be interested in your results, if you were shooting for a specific number and couldn't hit it, just for future reference.