Do people ever try to persuade you to take on a task by telling you that this job will only take five minutes? How often is that true? I reckon that a “five minute” job will take at least half an hour. If they say it will only take half an hour, it is likely to be a horrible job.
The same optimistic attitude is taken by people who ask for a “quick” proofread. What they usually mean is that they are pretty sure there are no mistakes, so you don’t need to look very closely.
Unfortunately, if you don’t look closely, things will get missed. And that is just one point against the idea of a quick proofread.
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