Student or Learner
If i go to a supermarket, i would ask the clerk what time do you close? but if i go to where people work and they have offices what shall i ask them.
what time do you end or finish? i htink these are weak.
THANKS IN ADVANCE
hmm i dont know but i think closing is for shops
Of course a person may be off earlier or later than the office closes. So if you want to know about the office, you could ask 'What time does the office close?' or 'What time do you close?'
As in your supermarket sentence, "you" will be understood to mean the (office)(business).