Tell me please which one of the following questions sound the most natural?
Until what time do you work?
What time do you work until?
What time do you work to?
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"What time do you work until?" would be the most idiomatic of the three; the third option wouldn't be said as it sounds a little ambiguous and could probably be interpreted in a few different ways.
I (British) would usually say this as:
What time do you finish work?
What time do you work till? (more colloquial)