No, it is not necessary.
John

Student or Learner
Hello there!
Is "long" necessary in this sentence, please?
"I left the oven on the whole night (long)".
Thank you
Will
No, it is not necessary.
John
I'm not sure it's correct. I would use one of the following three:
I left the oven on for the whole night.
The oven was on the whole night.
The oven was on the whole night long.
But as I said, I'm not sure about your sentence. Since JohnParis didn't object, it's probably fine.
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