Im a fairly experienced editor that picked up C4D a year or so ago.
I've gotten quite familiar with it now, but have no colleagues here to bounce ideas off. More importantly I have no idea how long it should take (it seems to take me a long time).
From sketches and rough drafts, I made this in about 5 days:
Obviously, the most time consuming part was being happy with all the elements (i made 3 different scenes before i was happy with this one, etc.), not to mention getting the light and textures right.
If you were my client and it took me the best part of a week to deliver this (from scratch) would this be acceptable?