He spends 5 minutes ironing his shirt and 3 minutes ironing his pants so that's 5+3 = <<5+3=8>>8 minutes
He does this every day for 5 days so that's 5*8 = <<5*8=40>>40 minutes
After 4 weeks, Hayden has spent 4*40 = <<4*40=160>>160 minutes ironing his clothes
#### 160