Feedback on my small project?(Time Calculator, Scientific Computing with Python)

Just completed another small project. I thought I would have to write a lot of loops for this one but surprisingly I wrote none. Actually calculation of time was the easier part here than printing it in correct format for me. Any feedback would be appreciated. I was thinking maybe in the last part of the code where I am writing all the possible return values could perhaps be improved.

https://repl.it/@CalmMango/fcc-time-calculator