5
How long does it take you guys to complete the book?
(programming.dev)
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I never went through it "end to end". I think it's important to cover the essentials up to ownership, lifetimes, generics, etc, but most of the topics after chapter 10 you can pick and choose as you come across them in real life. The most important is to just start any kind of project and see what questions you come across as you build.