Originally Posted by
Semaphore
What I do is to clear the final five opponents of pumpkin dream first, which takes a little over an hour. The opponents are very weak, so I pull all but one general off my team so that I don't have to wait so long through various skills taking effect. I need Master Strategist for the last three, but then switch to Saitoh Dohsan with a Playful Kaneko Sword equipped so that I can kill them much more quickly while only having to wait for the weapon skill to take effect rather than a whole long list of things. I intermittently read something else while doing this. For example, that's what I'm doing right now as I type this.
Once I've cleared that part of pumpkin dream, whatever time remaining I'm on the computer for the day, start another battle of the howling pass event if I notice that the previous one has finished. That seems to be good for around 100 clears of it if I'm at work most of the day, or probably more like 300 on weekends. Winning in one round, not just one battle, helps a lot.