Moving my edits here for visibility:

I just checked where we are in the LN (I haven't read it), and it seems we haven't even finished volume 1 yet. I'm guessing that's why this feels so repetitive and stretched. In text, you can just explain repetition with one line and be done with it. But this show actually goes through the trouble of showing it to the viewers. I'm guessing the 1st volume will end at around episode 8 or 9, which is a bit too much. 3-4 episodes per volume is standard but feels rushed. 6 sounds like a good balance. 9 is clearly too stretched out. This is already a SoL show. There's no need to water down content even further.

A good counter example would be Rokka no Yuusha. The 1st cour actually adapted just the first novel, but it never felt as slow as this. That's because that was an info heavy book with a lot of dialogue and twists. I guess the problem in Grimgar lies in the fact that it is being watered down despite being a slice of life story.