The process was long... took me about a year. It could have been much shorter if some personal and startup events didn't interfere with the process, especially since it's such a small book (~140 pages). Another book that size would probably take me about three months. I ended up doing all of the design myself as well, which slowed me down, but it was enjoyable as I was able to use some of my design background and editorial design knowledge – a nice break from writing and programming.
I have thought about making instructional videos, since the ones that I sell in the "complete" package have been doing well. The biggest issue is time, since I'm still running my startup solo. Second biggest is potential revenue, since my salary for WeddingLovely is currently at $0 (long story) so I'm supporting myself completely on what Hello Web App is bringing in.
Thanks for the fun questions!