No problem, thanks for the answer.
20 hours is a bit too long for my tastes so I guess I will - regrettably - pass on this one (for now!).
I will keep an eye on the game - it looks too interesting to let it go just like that.
I understand. Note, however, that the game can end considerably sooner if the DPRK earns enough VP (or takes the appropriate hexes - Seoul) to roll on the Automatic Victory table (in essence, a political victory fueled by military success).
There is also a scenario which combines the three small ones mentioned into a larger one. That one would probably take 5-6 hours to play.