How-long meaning

Used literally: what duration.

How long is the flight?

adjective
11
5
Used literally: what duration.

How long have you lived in Chicago?

He won't tell me how long he is going to stay.

adverb
5
4
Used literally: what length.

How long is that piece of string?

I don't know how long the Amazon River is.

adjective
2
5
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