How to ask how long will something continue in future?

Question

What is the appropriate way of asking question about how long an event will continue in future?

I want to ask, eg:

etc.

Please tell me the correct and natural way of asking these questions.

Where the answer may be known, as in all your examples, "will" is correct, but the second example could be written as, "How long would the product last in stock?", the subjunctive form, if the product were not in fact in stock when the question is raised. — DrMoishe Pippik, Apr 20, 2015 at 20:36
@DrMoishePippik is using How many more days correct ? And no prepositions , eg for, is required ? — MAKZ, Apr 21, 2015 at 5:32
Both are correct, with and without a preposition. A preposition may be "understood", so "For how many days will it last?" and "How many days will it last?" are acceptable conversational English. See books.google.com/…, for example. — DrMoishe Pippik, Apr 21, 2015 at 20:42
Answers entered as comments leave questions showing as 'unanswered'. — elc, Apr 21, 2015 at 23:15

elc · Accepted Answer · 2015-04-21 23:13:52Z

2

As indicated in the comments, those are all perfectly correct.

answered Apr 21, 2015 at 23:13

elc

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is using more in those sentences considered correct ? as in how many more days?
– MAKZ
Apr 22, 2015 at 8:21
That is correct. The effect of more is to suggest or emphasize that what is continuing has already gone on for some time. It can, depending on context, also suggest doubt as to remaining time.
– elc
Apr 26, 2015 at 0:31
Oh, but if something hasn't happened at all yet, it if it is just starting, then more would not make sense. You have to already have something (in this case have days banked) before you can have more.
– elc
Apr 26, 2015 at 0:32

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