IIRC Lufthansa is one of the airlines that hires nonprofessional pilots and trains them from the ground up.
US carriers tend to hire former cargo pilots (UPS, FEDEX) as well as military aviators.
I assume he was flying short to medium length legs inside Europe..about 2 hours duration..from what I read pilots on these legs fly about 90 hours/month...give or take...so 18 x 90 = 1670 hours...OK..cut it back for whatever..assume 1200 hours..looks like he was way underused...unless he flew a different plane..which is highly unlikely..you don't start a novice off by having him learn 2 different airplanes..