javascript - Get hours difference between two dates in Moment Js

#short
#javascript
#date
#momentjs
I'm able to get the difference between two dates using MomentJs as follows:

However, I also want to display the hour when applicable (only when = 60 minutes have passed).
However, when I try to retrieve the duration hours using the following:

it is returning the current hour and not the number of hours between the two dates.
How do I get the difference in hours between two Moments?