Definition from macmillandictionary.com
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I hope you haven’t been waiting long.
People are living longer nowadays.
Smoking has long been linked to lung cancer.
He wanted to stay as long as he could.
Their relationship didn’t last long.
I knew her long before she became famous.
I was born long after my parents got married.
I should have ended the relationship long ago.
The time for negotiations has long since passed.