Since June has 30 days, halfway is 1/2*30 = <<1/2*30=15>>15
The total number of video hours halfway through June is 10*15 = <<10*15=150>>150
When she doubled the number of video hours, the total per day became 10*2 = <<10*2=20>>20
The total number of video hours for the remaining days is 15*20 = <<15*20=300>>300
The total number of video hours for the whole month is 300+150 = <<300+150=450>>450
#### 450