Daniel practices for a total of 15 x 5 = <<15*5=75>>75 minutes during the school week.
He practices 15 x 2 = <<15*2=30>>30 minutes each day on the weekend.
So, he practices a total of 30 x 2 = <<30*2=60>>60 minutes on the weekend.
Thus, Daniel practices for a total of 75 + 60 = <<75+60=135>>135 minutes during a whole week.
#### 135