Here is my attempt:
1) I think maybe an hour and a half, like @naomi I could continue fiddling, there are things I’m not happy with..
2) I loved using Articulate Rise, I thought it was very easy to use. However, I watched all of the videos, so that certainly helped me get started.
Some of the colour coding I found difficult, like if I had put a background colour for one heading, it didn’t save as an option for the other heading. In the end I copied the colour number into each so they should match.