It sounds like 60s just isn't a long enough delay in that scenario
And if you can't explain why this doesn't apply to Tor's proof of work spam filtering then that seems to confirm this isn't true
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From a usability perspective, 60s would be a terrible user-experience design.
And that would not have any significant impact on spammers, that's the point.
Why would it make any difference waiting for 10s, if the spamming server is a dedicated machine? The enrgy cost on the spammer side would be negligible.