I think displaying the running time to the right of the result would be
ideal.
The user will not think it is program output, since it is to the right and
on the same line as the result.
iex(14)> :timer.sleep(4000)
:ok 4.000s
Let's go easy. :) Showing the timer as it does adds a bunch of complexity.
Showing it on the right also means we need to integrate with the inspect
algorithm to make sure they do not overlap. All of those are added
complexity. For now, we will only show a message at the end when above a
threshold
