User blog comment:Shinhwalee/Major Event Preparation Guide for Admirals/@comment-26294760-20150725040143/@comment-3502824-20150725074459

Unfortunately the best expeditions are usually spamming 2 (mandatory), 5 (sparkled) or 21, and 37 or 38 for Hours. Add in 6 to replace 5/21 if you need bauxite. And this means doing this for hours as much as possible (Ex. I had taken my laptop to my college before to do expeditions between classes by usually doing Tokyo Express 37 and 38, along with expedition #9).

So basically, if you are stuck doing long-hour expeditions for too long, the gain isn't much compared to spamming the shorter ones that actually give high hourly rate.

If you would like to gain more resources than now, I highly recommend using sparkled fleets for the expeditions. In the long run, their total gain is quite a lot.