I've programmed in over 20 languages, it typically takes a couple days to a week to make a meaningful contribution to a project. The more languages you know, th

I've programmed in over 20 languages, it typically takes a couple days to a week to make a meaningful contribution to a project. The more languages you know, the easier it gets because there are very few truly novel things in programming languages - just different syntax for doing the same. To achieve mastery in a language takes years of steady use, a constant attention to learning best practices, and good code reviewers.