Go constants are untyped, which means you can pass a number as argument to a function that takes a type whose underlying type is an integer (e.g. time.Duration)

Go constants are untyped, which means you can pass a number as argument to a function that takes a type whose underlying type is an integer (e.g. time.Duration) without having to explicitly mention the type. That's how time.Sleep(5 * time.Minute) works