Knee
EAT LEJ work to Sub Part Q limits so their definition of day off may not be as you expect it in the UK. SBQ is 36hrs with 2 local nights after a max weekly 168hrs. 95% of trips are "overdays" as you suggest then back to LEJ to loiter with intent for 2-6 hrs then back out again. Bear in mind the express package world is driven Sunday-Friday. No idea on the € or the days off per month.
Commuting to LEJ is difficult, best bet is Berlin then the train or move there.