Honestly, that's something you should be able to guess at, from how long it took your previous "new" programmers. From my experience, this mostly depends on the

Honestly, that's something you should be able to guess at, from how long it took your previous "new" programmers. From my experience, this mostly depends on the complexity of existing code - I've seen code that could be reasonably extended in a few weeks, but also monstrosities that took months to understand and start contributing.