What does your question have to do with what I posted, I am actually confused.

as far as if someone could do a full amp install in 18 minutes, probably do able by a handful or more of good fast installers under the right circumstances but definatly not a regular occurence

Just my personal opinion though

Now I will say this, that we on a fairly regular basis have people come in at the end of the day and want something done right then, so we will put multiple people on it and knock it out quick like

That actually happens quite often around here