Truly, this arc just raises the question of "what are they actually doing"? As in what are all these missions entailing that are so exhausting? If you go by the databooks for example:
>Guy has completed 788 official missions in total: 86 D-rank, 270 C-rank, 210 B-rank, 199 A-rank, 23 S-rank.
What the FUCK is an S-rank mission?