Kyon said he cant asked other servant about lucaon since the servant keep changing so that means hes the longest one working there without quitting unlike the others, probably?
Maybe the others quit and new ones arrive then the process begin again but only Lyon has remained under Lucaon's service . . . Don't know really
I though it was a way to say some time have pass ... no sure tough
Maybe.. ..
Cause lucaon hate servant.. ...
perhaps every once a month there was a servant resign that's why kyon is the longest.
http://www.mangago.zone/read-manga/royal_servant/uu/royal_servant-chapter-4/7/
Lucaon's a bad-tempered master, so the staffs keep on changing until Kyon becomes the longest working there..
because the master changes the workers regularly ( he doesn't trust them )
but kyon is an exception
why in this chapter they say that Kyon was the longest working there?
http://www.mangago.zone/read-manga/royal_servant/uu/royal_servant-chapter-7/21/