The phrase "how long does it take" is a question asking about the duration required to complete a specific task or process. It usually stands alone as a question, for example, "How long does it take to drive to Miami from here?" In contrast, "how long it takes" is used as a declarative phrase within a sentence providing a response or statement about duration, for example, "Can you tell me how long it takes to install a ground source heat pump?" Both forms are correct depending on context, but "how long does it take" is the standard inquiry form.
If a more specific context is needed—for example, visa processing times, transportation, or task duration—please provide details for a precise duration answer.
