Talk:Expeditions/@comment-86.70.90.211-20151024210159/@comment-80.229.40.196-20151025160250

B1 & D4 only gives you koban in great success expeditions, while the expeditions lasting 6+ hrs guarantee koban. So it all depends on whether you're lucky to repeatedly achieve great success expeditions. Boost you swords into fubuki mood and it a try, in both cases you'll still get a lot of koban!