Billions works well for learners who already understand English comfortably and want more challenging listening practice. Following the story requires attention, so language difficulty is not the only challenge here. The language mixes everyday English with a few expressions that need attention, so it works best for learners who already have a solid base. At an average of around 112 words per minute, the dialogue is generally manageable, though some exchanges require more attention. If your English is close to B2/C1, Billions can be useful for building confidence with more complex narratives.
