...
func main(){
    duration:=GetDuration(func(){
    //do sth
        resp, err2 = client.Do(req)
    })
    fmt.Println(duration)
}
...
func GetDuration(f func()) time.Duration{
    t1 := time.Now()
    f()
    t2  := time.Now()
    return t2.Sub(t1)
}

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