He brushes his teeth 3 times a day, after breakfast, lunch and dinner. He brushes for 2 minutes so that’s 3*2 = <<3*2=6>>6 minutes per day.
He brushes 6 minutes per day so after 30 days he has brushed 6*30 = <<6*30=180>>180 minutes
There are 60 minutes in 1 hour and he brushes for 180 minutes so that’s 180/60 = <<180/60=3>>3 hours
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