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What's a difference between

a)How long is this gonna take?

b)How much longer is this gonna take?

? Thanks in advance:)
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We say 'gonna', but we write 'going to'.


How much longer is this going to take? This sounds like it has already taken a long time.


How long is this going to take? This does not sound like it has already taken a long time.


Clive

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Comments  
Both can be used at any time, but "how much longer" implies that the activity is already in progress.
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“How long” could be used either before an event starts to find out how long it's expected to take, or during the event to find out how much more time will be needed. “How much longer” would only be used in a situation where the event was in progress and already considered to be taking a long time – i.e. ‘longer’ meaning an addition to the already long time period.
It was a great help, thank you very much.
So thanks
Students: We have free audio pronunciation exercises.
Please note that "gonna" is common in conversation, but should not be used in writing. Because this is an English grammar site, we do encourage people to write correctly.
I see the difference. I think the word much made it to already in progress. Thanks so much for your help.
 Clive's reply was promoted to an answer.
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How long is this going to take is asking for the length of time for the entire project. How much longer is asking for the remainder from the time of the question (or answer).

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