I appreciate all the comments. Jeff your math is correct. For most concert productions, the average song will require 3-4 hours to program. Of course, there are the solo piano or guitar ballads that are quicker but some of the more complicated pieces take longer. It's not unusual to spend 8 or more hours on an opening or closing song.
What is frustrating is when artists come in to sound check, noodle around and decide to change an ending to a song or some other change along those lines. It takes them ten minutes of rehearsal to figure out and takes me another hour to reprogram. It's those times when I say to myself "I should just go back to playing drums!"
We always program ways to improvise things should someone decide to add a song at the last minute and that is an entirely different discipline and even more complicated these days as all the video elements are controlled by the lighting director as well.
I will say that music has given me a significant edge as I can learn the material as fast as the guys on stage and timing of cues is never a problem. So if you want a shaft of light to hit the drummer on the e of 4 when he hits the china cymbal... No problem. If you want to add a Batman "POW" on a video screen at the same time, I've got that. It's a great deal of fun, but I am no stranger to the 18 hour work day. Heck I've had work days that have been well over 48 hours.
By the way Jeff, if I were to create a custom cabinet solution, I would spend a lot more time than you and the end result would look like something that would be a fantastic storage solution in a ten year old's tree house.