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let me know when you are free vs let me know once you are free

let me know when you are free vs let me know once you are free which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

let me know when you are free is the most popular phrase on the web.

let me know once you are free

11 results on the web

let me know when you are free

11,360,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • Apr 8, 2007 ... ... for reply well sure understand well kids are definitely are first priority do stay in touch and please let me know once you are free shall take out ...
  • Let me know when they give us the go ahead.
  • Let me know when things free up.
  • Great. Let me know when they got something.
  • Let me know when we're talking.
  • Let me know when everything's ready.
  • Let me know when it's up and running.
  • Let me know when you're free, and we'll get it on the calendar.
  • Let me know when you've got them.

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