Western Australia · Theory Test (CTT) · Road rules

How long can alcohol take to reach its highest concentration in your blood?

The answer

  • About 6 hours
  • It peaks immediately
  • About 10 minutes
  • Up to two hours, especially if you have eaten Correct

Why that's the answer

Alcohol can take up to two hours to reach its highest concentration, especially if you have eaten. That means your BAC can still be climbing after you stop drinking — feeling fine when you get in the car proves nothing.

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