In my first job as a Junior Dev it took me almost a year because we had 3 different very large products and they had an extremely niche user base so I had to become familiar with those processes. As others have said if you can understand the user experience it makes it a lot simpler to understand the code. Since becoming a consultant I've had a wide range of experiences. Some times it takes as little as a few days to understand the code, sometimes you never do because the guy who wrote it is gone and there's no documentation and the users can't explain how they use it.
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In my first job as a Junior Dev it took me almost a year because we had 3 different very large products and they had an extremely niche user base so I had to become familiar with those processes. As others have said if you can understand the user experience it makes it a lot simpler to understand the code. Since becoming a consultant I've had a wide range of experiences. Some times it takes as little as a few days to understand the code, sometimes you never do because the guy who wrote it is gone and there's no documentation and the users can't explain how they use it.