The IT segment catering to the latter of the subject, is the ERP segment.

Businesses still continued before computers, based on paper, file based manual systems. This comprise a host of activities like invoicing, physical stock,...etc.

A typical invoicing program would be in the range of several thousand lines of code, resulting in not less than around 10 man days.

Well that is the time it takes to INSTRUCT THE COMPUTER
to carry out the invoicing activity.

How long will it take to train a human to carry out the task of invoicing? Well if that human is smart, may be an hour or less. But let's say that it be one day(8 to 5).

So we are saying that we coders are dumb!!!! We are taking 10 times the time to code than the time to train!!!! How can that be?

Well, a human has a mind which can be trained. Well give the machine a mind. Real Mind, not AM(Artificial Mind).