How long do you know it? vs how long did you know?

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Looking on the internet deeply has found these results:

how long do you know it? is the most popular phrase on the web. 

how long did you know?

1366,000 results on the web

how long do you know it?

1457,000,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • It doesn't look like this phrase is very popular! The search could not find any examples on the internet.
  • How long do you know this already?
  • How long, do you know?
  • Your woman, how long do you know her?
  • So how long did you know Quintana?
  • So how long you know Rick?
  • Do you know how long'?
  • How long you know about this?
  • New lungs work, but for how long, you know?

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