I reached a level where I can speak English like a native speaker.

We got to a point where we can agree.

In the previous sentences, the level and the point of view are not real places nor real time but the word "Where" is used. I think I got used to it because it's more common. I feel like when it comes to real time, the word where can also be used:

I was there at the time (Where - When) the plane took off.

I can't wait for the day (Where - When) my children graduate.

You should have paid on the day (Where - When) the bill was issued.

The camera was recording at the moment (Where - When) the expulsion happened.

  • Points and levels are real places in terms of knowledge. The others you list are not. Have you researched this issue? – Lambie Aug 3 '18 at 17:05

In the last four examples you provide, the use of 'when' would be correct. This is because each sentence is referencing a point in time. In the first two sentences you provide, 'where' is used because the speaker is referring to some position or state they are in, not a point in time.

Although you may see 'where' used in contexts such as those you provided in the last four examples, it is incorrect.

In conclusion: 'when' and 'where' are not interchangeable.

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