Chapter 1: Page 8: Line 26

 Each day among his Devoirs is a visit, however brief, to Mason's grave.

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Line 26 Vulgarized:
Cherrycoke takes a moment away from his duties each day to visit his friend's grave.

Subtext:
Aside from being a brief moment in which the reader gets a glimpse of Cherrycoke's compassion and how hard the loss has hit him, we get another analogy for nostalgia (which is what this paragraph of lines seems to be focusing on).
    By visiting a grave, one is taking a brief trip to the past, to remember the moments when the dead was living. This is the physical manifestation of what Cherrycoke does nightly in his sister's family's house by telling stories of his time with Mason and Dixon. We all do this, every day, whenever we bask in the memories of times gone by. It doesn't matter if it centers around a deceased loved one because the past itself has been interred in an abstract grave. Every memory is a graveside visit. History is a cemetery overflowing.