On Trey's list there are 7 + 1 + 4 things to do = <<7+1+4=12>>12 things to do in total.
Each thing takes 10 minutes to do, so 10 minutes x 12 things = <<10*12=120>>120 minutes.
An hour has 60 minutes in it, so 120 minutes / 60 minutes in an hour = <<120/60=2>>2 total hours it will take Trey to complete his list.
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