i spent maybe 2 hours per week watching videos and 3-4 hours per week completing exercises.
it was well worth it, but really only covered the harmless, "old-school" functional aspects of Scala plus traits and type parameters. Many very important (and more innovative) aspects of Scala were left out, like implicits, macros, reflection, parallel collections, actors, annotations, type variables, self-typing, etc., etc.
cheers
gerald