longest i can think of right now would be:
Charasis: Gewölbe des ewigen Schlafes
Kurns Turm: Durchbrechen der Leere
Insel der Zuflucht: Flucht von Darathar
Die Bucht der Verwesung: Epischer Angler
so i guess good old angler wins
edit, looking further, i found this:
Schloss Nektropos: Handwerker-Botengänge
mind you: im looking through an unsorted 32mb plaintext file of all strings the client does translate for instance names i can think of so this does not have to be the longest name to exist, but its the longest i found
edit2: i just realized that i saw the athaneum zone name fit in the size you built into 11.0 . what i was thinking of is visible in the screenshot above, the zone should actually be called DT guild hall, but as it seems its either cut off or contains a \n character so theres nothing you could do to fix that, thanks tho'
now onto the joined-date