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Answer :

Approximately 25-30 minutes but it could depend on the drug

Answer:

The correct answer is 30 minutes on average

Explanation:

Taking  medicine orally demands the substance to travel through the  digestive system, being broken down in the stomach, and  later on  be absorbed by the blood in the intestines, all that before reaching the brain.  

This is the slowest method to administer a dose, in the other hand the drug effect  lasts longer, sense is evenly spread trough the body.