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This. Actually it will usually take a new developer far less time to learn the language and tools they're using for development (if they didn't know them already), than it will to learn the ropes of the company and project they're working on.  I usually like to anticipate an average new body to get up to speed in 3 months or so.  At least 12 months before they're considered experienced and trustworthy enough to have actual ideas that might impact the business.  And incrementally longer for those ideas to be listened to and accepted in shorter time and with less prompting and by more important people.