Whatever time frames you apply, the only way to really learn a language is to use it. Reading a book, blog articles, and watching videos on YouTube won't give you the hands on experience necessary to internalize how everything works.
Day 1: read the introduction of a book, set up editor and environment
Day 2: (superficially) learn flow control and type system
Day 3: practice with coding problems on codewars
Day 4-7: reimplement one of my projects
Week 2: read the second quarter of the book and continue with puzzles
Week 3+: Just projects, maybe invest a day into tooling somewhere in between
That is assuming 1-3 hour days
And then never get to the third and fourth quarters because the practise you get from actually typing stuff is far more valuable? :)
I usually pick the authoritative book / advanced book. Think "Programming PHP", "The joy of clojure", "The C Programming Language", etc. I don't necessarily need to know all about performance optimization, the async model or non-html templating.
Reading a technical book cover to cover feels wasteful imo