First find Carolyn's total violin practice time by tripling her piano practice time: 20 minutes/day * 3 = <<20*3=60>>60 minutes/day
Then find the total amount of time she spends practicing each day: 60 minutes/day + 20 minutes/day = <<60+20=80>>80 minutes/day
Then find the total time she spends practicing each week: 80 minutes/day * 6 days/week = <<80*6=480>>480 minutes/week
Then find the total time she spends practicing each month: 480 minutes/week * 4 weeks/month = <<480*4=1920>>1920 minutes/month
#### 1920