"Oh yeah that should only take a few hours!" he thinks to himself, completely forgetting about how complicated it will be to test, how long our build process takes, how long it takes to get reviews, how long Q might take, etc...
Sure, this feature is 15 lines of code which took me like 2 hours to figure out, but there's also like 100 lines of test with really gnarly data mocks to go with it which took 2 days.
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