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Hi, Ahmed,

- (How long ago - When) did you start studying English?

Both questions are correct and largely interchangeable. With "how long ago" you might expect the answer to consist of a period of time followed by "ago," so it will be up to you to calculate when that was. By contrast, with "when" you might expect a more straightforward time reference, for example: in 2010, in June, last week.

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