Once every two hours vs Once in every two hours

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Senior Member
I was talking to a friend the other day and I told him to help me check my stove (I was making soup) once every two hours to make sure the soup was okay. Then suddenly, I thought to myself: Should I say "once every two hours" or "once IN every two hours"?

Are the two interchangeable and both acceptable?

Many thanks!
  • JJohnson

    Senior Member
    Texan English
    You were right the first time.
    "Please check the soup (once) every two hours."
    "Once in every two hours" would mean "please check the soup at some point within a two-hour period".
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