I want to ask my colleague till what time he is supposed to work here, and what is latest time has has worked at office, Can I ask him
What is the latest have you worked here?
Is this expression idiomatic?
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Although that sentence would probably be understood by your colleague, it is not particularly idiomatic. Instead the following would be preferable:
What is the latest you've ever left the office?
I once stayed in the office until 8pm! What's the latest you've ever stayed 'til?