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Suppose I want to know how many hours are needed to be able to do it on my own, like for instance, driving a car.

How many years of/at practice do I need to became a basic user?

In the quoted sentence which one preposition would you use?

If both are acceptable, in which context would one fit better than another?

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up vote 8 down vote accepted

In that sentence you need of.

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Would you use "How many years have you been at practice?" in place of "How many years have you been practicing?" – Gaffi Aug 16 '12 at 21:26
@Gaffi, at practice normally means "engaged in a session of practice". It most often implies practicing with others: He's at football practice or band practice. If the subject is working alone, He's practicing would be more usual, but He's been at practice for two hours wouldn't raise eyebrows. – StoneyB Aug 16 '12 at 23:50
As @StoneyB says. – Barrie England Aug 17 '12 at 6:35

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