It took me about six months to feel really comfortable after working on toy projects and libraries a few hours a week. I published a library that is still being

It took me about six months to feel really comfortable after working on toy projects and libraries a few hours a week. I published a library that is still being used by others after only 2-3 months and looking at it now I still think it was done relatively well, though it was basically a simple wrapper. I began by reading the entire "Learn You a Haskell" book which is probably the best introductory book I've read about any programming topic, and then most of Brian O'Sullivan's "Real World Haskell". There are better sources than the latter now, which was outdated at the time (~2014). Of course, focused full time or at least half time it would not take nearly this long for a team to come up to speed as long as they have at least one really strong member from the start. I'd say people could become productive in a couple of weeks in those circumstances; which is still much longer than pretty much any other language that is actually used in industry.