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We used a swapping service, normally it would take10 confirmations approximately 20 minutes. Block time is 2 minutes, 10 confirmations is a protocol design to stop double spending. Block time x Confirmations = settlement time. If block time comes down, or confirmations are changed at protocol level then settlement time reduces.
it's not to do with double spends, for that you have key images. it has to do with potential block reorgs and not including bad/invalidated outputs as part of a ring signature.