Hi, It is an adjective - and the first sentence is correct. Hoa Thai
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LiveinjapanThe session is three hours long. (long is an adjective, right?)
The session is three hours.
Are both correct and mean the same?
They both mean the same. The second is a kind of "cut-down" version of the first that is perfectly OK (in my view) in everyday conversation and informal writing. I think I'd probably avoid it in very formal w