Does 'long hours' mean 'overtime work'?

Does 'long hours' mean 'overtime work'? Is this a common phrase or a kind of slang?

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Originally Posted by Gregory_E_V

Does 'long hours' mean 'overtime work'? Is this a common phrase or a kind of slang?

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Well, it is not slang. And yes, it can mean OT (overtime hours). It can mean work hours that just drag on and you can't wait till the day is over.
It can also mean working long series of shifts with little time in between for your rest so you can be ready and in shape to work again.

Thank you, Marylin, for splendid explanations