The Graveyard Shift is a fast introduction into the very basics of Wrath & Glory.
While not covering the particulars of the revisions Cubicle 7 has completed to the original work released by Ulissses Spiele the adventure itself gives a good introduction into one of the less seen areas of the Imperium, a Cemetary World
It should take one or two sessions, depending on how thorough your players can be, and if a Game-Master wants to add in a few bits they could likely span it out over 3 sessions.
In it is useful bits to grab for your own toolbox as well in relation to bestiary entries and a chart for encounters in ruins.
All in all, a solid short adventure to grab for more than one reason.