The use of 'how long': 'How long is your paper?'

[Tom]

[Mister Micawber]

.
It most likely means: how many words or pages in length?
.
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Native English teacher at Mister Micawber's

[Yankee]

.
Mister Micawber is correct as usual. :D

Amy
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln