@Peter-Ostry Well, that 90 minutes included half a dozen interruptions from folks arriving for our workshop. I've found it to be a bit of an art to do setup of a complex rig while graciously chatting with folks just long enough so that they don't feel "dissed" but also giving them the idea that you're "in the midst" and the trot off with a "well I see you're up to your eyeballs so I'll let you get to it".
Even when it is just a plain gig (i.e. not associated with a workshop), I often have curious techno-aspiring musicians asking about this and that. I sometimes engage them with some "the elbow's connected to the wrist bone, and the wrist bone's connected to the ..." type talk. Their eyes glaze over pretty quick ...
One big help is to label both ends of (pretty much) every cable. I use a label maker and have lots of colors (red=right audio, blue=left audio, orange=DC power, black=MIDI, green=stereo unbalanced, ...) and cover most of those labels with clear heat shrink-wrap. Then most of the hookup is minor ... when it says "VL70 Left Out" at one end and "MX122 Ch3 Left In" at the other, setup becomes mostly mindless.
Thanks for the assistance, Peter!!