Lilly cleaned for 8 hours / 4 = <<8/4=2>>2 hours.
This means that Fiona was cleaning for 8 hours total cleaning – 2 hours Lilly’s cleaning = <<8-2=6>>6 hours.
So in minutes, Fiona was cleaning for 6 hours * 60 minutes in an hour = <<6*60=360>>360 minutes.
#### 360