This is often used figuratively, to mean "many, many times."
"once-or-twice." YourDictionary, n.d. Web. 11 November 2018. <https://www.yourdictionary.com/once-or-twice>.
once-or-twice. (n.d.). Retrieved November 11th, 2018, from https://www.yourdictionary.com/once-or-twice
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