If you do the exercises it might take seven weeks at a few hours each. If you don't, you could read the book in a night. I don't think I finished it (it was a work bookclub that died out halfway); now would definitely be good time to go back. There's a second book in the series I wanted to try for Elm and Elixir.
I read it over a couple of weeks of sitting out in a pub beer garden on evenings I wasn't doing anything else.
I almost certainly didn't learn everything there was to learn from the book in the process, but I definitely felt like I'd got my value for money out of it.
