https://news.ycombinator.com/item?id=23621930
Google’s experience with Haskell
https://news.ycombinator.com/item?id=21916629
Max Gabriel at Mercury claims the time to become productive is 4-6 weeks.
https://news.ycombinator.com/item?id=35442409
Claim of time to first commit is 1 week for multiple people, but unsubstantiated.
https://news.ycombinator.com/item?id=14148786
Guy claims he got a simple Haskell app up in 1-2 weeks of what seems to be self-learning.
There’s also someone who hung around FP Discord, a C++ programmer, who decided to speed-run Haskell and built a compiler as his first project. This… didn’t go well, mainly because while he managed to get a fairly advanced Haskell project working in 3 months, he burnt out.
IIRC, there’s someone at Hacker News (I’m searching for the comment) who can do 2-4 weeks onboarding for non-Haskellers.
Compare this to, say, Ying Wang blowing 3 months to go through HPFFP: A Pythonista's Review of Haskell > Ying Wang
I mean, it’s not exactly good, and any hopes of getting Haskell to be taught as quickly as Python are delusional. But if we are obsessed with pure pragmatism, and are willing to constrain the dialect, the time needed to train an idiom of production and productive Haskell is not going to be as high as you think it is.
Moreover:
It’s just good practice to learn Haskell by doing and refactoring; I consoled the disappointed C+±er by pointing out that he was basically trying to do the equivalent of learning Template Metaprogramming before writing his hello world.