"Till what time are you open?" at night, shop, grocery store etc.
Would you say that? or what would you say?

Question

"Till what time are you open?"  at night, shop, grocery store etc.    
Would you say that?  or what would you say?

Answer

Another way of saying it would be:
"What time are you open til?" (Spoken English, heard 44% of the time)
"What time do you close?"  (Written and spoken, heard 53% of the time)
"Til what time are you open." (Most formal, heard 2% of the time)
The remaining 1% of the time consists of mumblings you can't understand, by drunks asking when they can get their last beer.

Answer

It is much more common to say "What time do you close?"

Answer

More people would say, "How long are you open?" or "When do you close?"

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