Update: I spent some time with @errosema last night and looked over some of the slow-printing files. Layer height was set to 0.1155 mm, which is lower than the usual “Art” layer height of 0.125mm.
Reslicing a file at a more reasonable (for the part) layer height generated a reasonable-print-time result.
a) Don’t use a non-DMS copy of KissSlicer at home unless you are sure of the settings, as they may not match the “standard” settings (Art, Mechanical High Density, et al) at DMS
b) Don’t use an already-logged-in copy of KissSlicer (piggybacking on another user’s login) unless you are sure of the settings, as that user may have customized their settings either temporarily or permanently.
c) Don’t start a slice without checking which Style Name is selected
Trust, but verify