Diana’s raise was 20% of her 30-minute video game time, or 0.20 x 30 minutes = <<20*.01*30=6>>6 minutes.
Diana is now making 30 minutes + 6-minute raise = <<30+6=36>>36 minutes for every hour she reads.
Diana read 12 hours x 36 minutes of video game time, so she received 432 minutes of video game time after her raise.
Before, if Diana read 12 hours x 30 minutes of video game time, she would have received 360 minutes.
The amount she received after her raise, 432 minutes – 360 minutes at her old rate = <<432-360=72>>72 more minutes after her raise.
#### 72