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It's not difficult to make these estimates, it's just a lot of work and it you just need time. So the first estimate is that you need a day to find all the source files and to find out how many there are. Once you have all the source files and know how many there are, you can make an estimate how long it will take you to examine all the source files and ...


I would start writing unit tests -- start with the sections of code that work, write characterization tests that demonstrate (and will help preserve) their correct behavior. Write additional tests that model how the code should work. Get them to pass, without breaking the tests that are already working. Once you have a nice suite of passing tests in place, ...

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