how long is a piece of string
idiom
British, informal
—used as a reply to a question when the answer is not known
"How long will you be staying?" "How long is a piece of string?"
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“How long is a piece of string.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/how%20long%20is%20a%20piece%20of%20string. Accessed 26 Apr. 2024.
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