Is my question grammatically correct ?
Someone wants to say he is at home until for example 10. Is this interrogative sentence correct for asking about the time? Here is the question : When are you at home until?

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What time are you home till? OrUntil what time arw you home? OrWhat time will you be home till? etc.

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"Is this interrogative sentence correct for asking about the time? Here is the question : When are you at home until?"

That's fine. Usually the "until" is shortened to 'til

When you listen to some native speakers say this, it can be difficult to figure it out the first time. I know I'm guilty of running the words together in this phrase so it's almost like one long word.

Evden çıkmadan dil öğrenme fırsatını kaçırmayın. Deneyimli dil eğitmenlerimizden oluşan seçkimize göz atın ve ilk dersinize şimdi kaydolun!