My team was able to get up and running with elixir pretty quickly. I have an extensive ruby background and that helped me, but two other developers had python backgrounds. One was productive after a week the other after three. I think it really depends on how excited you are when you first get your hands on elixir.
Cool, well you got some nice looking graphs taking the path you did. I am working on an app that has graphing, and I am running into some of the problems you mentioned. I am using the highcharts library.