To be fair, the amount of training they get is also twenty minutes.
Why waste money on expensive training.
There is a story related by some US troops in Iraq, how they arrived in a village and find a group of 20 Iraqis in uniform....but wearing shiny dress shoes....and looking very confused and frightened. They promptly surrendered.
Thirty minutes before they were various businessmen and workers waiting for a bus...only to be tossed into a truck, taking to the front, given half uniforms and rifles...and left alone. They could hear the Americans coming.
Behind a wall was their briefcases and suits.
What they did with them. "Got them to change back into their work clothes and drove them back to town to go back to work."