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If I ask a flight attendant

いつ、とうちゃくしますか？

versus

とうちゃくは何時ですか？

Is there any difference in nuance if I want to know _how much time is left_
until we land? Meaning, I want to know how many hours and minutes we are
airborne, not at what local time we are expected to land (figuring out the
aircraft's timezone while in the air is not always easy).

_I noticed that there already is a similar, more general question posted here,
but mine is more specific._
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2017-02-18T08:15:46.547
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2017-02-21T06:45:11.210
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question
word-choice nuances
Difference in nuance between いつ and 何時
いつ means "When"

何時 means "What time"

To the first, she might answer "In an hour" "At 4pm" "Very soon" ect - just
like in English. To the second, she would almost certainly answer "At 4pm"

Neither one will necessarily give time remaining in the air.
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2017-02-18T08:22:44.630
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2017-02-18T08:22:44.630
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answer
If we pronounce "何時" as "何時{いつ}," it is the same meaning of "いつ."

If we pronounce "何時" as "何時{なんどき}," it has the same meaning of "いつ," but it is
the old-fashioned word.

「いつ、とうちゃくしますか？」 = 「とうちゃくは何時{いつ}ですか？」  
This Japanese sentence doesn't tell what time in your mind, local time of
departure area or local time of arrival.

You can clearly tell, 「現地{げんち}時間{じかん}でいつ、とうちゃくしますか？」 =
「とうちゃくは、現地{げんち}時間{じかん}の何時{いつ}ですか？」 or 「出発{しゅっぱつ}地{ち}時間{じかん}のいつ、とうちゃくしますか？」 =
「とうちゃくは、出発{しゅっぱつ}地{ち}時間{じかん}の何時{いつ}ですか？」

In general, we use the local time of the destination when we need the arrival
time.
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2017-02-19T01:33:53.807
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2017-02-21T06:45:11.210
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answer