Before modern AI coding tools, what was a realistic amount of time for a developer to write around 1,000 lines of code? I know the answer depends on the task—some work may involve repetitive SQL, CSS, or HTML, while other code requires debugging, design, and careful testing. I'm mainly curious because AI-assisted development can now produce thousands of lines quickly, although that code still needs to be reviewed and corrected.
3 Answers
Lines of code are a pretty poor way to measure productivity. A developer might write 1,000 simple lines in a few hours, while three difficult lines could take several days if they involve a tricky design problem or an elusive bug. The language, project, experience level, and amount of testing all make a huge difference.
For a new Java project with straightforward requirements, 1,000 lines might take roughly two or three hours to type. But that estimate excludes planning, reading existing code, debugging, code review, documentation, and tests. In a real project, those activities often take longer than entering the code itself.
There isn’t a useful general answer. I’ve spent weeks on projects that never reached 1,000 lines, and I’ve also produced roughly that much repetitive code in an afternoon. What matters is what the code accomplishes and whether it is reliable and maintainable, not the raw line count.
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