Learn English - More Workplace Expressions
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How long is a piece of string?
English Meaning 1
> used to show that an answer is difficult or that the length of time can’t be estimated.
English Example 1
“So, you’re my lawyer, how long would it take to make a contract?”
“well, how long is a piece of string?”
“You really need to decide first exactly what you need protected and then I can give you a more specific answer”