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?


In that sentence you need of.

  • 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
  • 1
    @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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