Lets say 1 second of torture is -1 000 000 utilions. Because there are about 100 000 seconds in a day, and about 20 000 days in 50 years, that makes -2*10^15 utilions.
Given some heavy utilitarian assumptions. This isn't an argument, it's more plausible to just postulate disutility of torture without explanation.
It's arbitrarily chosen from the dust speck being -1, I find it easier to imagine one second of torture than years for comparing to something that happens in less than a second. It's just an example.
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July Part 1