Learn what "how long do" means, when people say it, and how to use it naturally in English.

This means the speaker is asking how long the other person can continue the current behavior or deception.
From Duty Or Desire, Episode 7
The speaker is challenging someone who seems to be pretending or maintaining a lie.
Use this in an argument when you think someone is pretending, lying, or acting unsustainably. It often sounds accusatory.
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