time.Millisecond * int confusion

Question

In the below example, if the 1000\'s are both int\'s (which I think they are) why would the bottom fail to compile?

//works
time.Sleep(1000 * time.Millisecon         


        

Answer 1

You should convert to time.Duration (which underneath is an int64)

var i = 1000
time.Sleep(time.Duration(i) * time.Millisecond)