I think the EU data center queues may be longer because the language flags actually mean something there. NA has a small French population from Quebec, but English is the majority language and the secondary language is Spanish, which isn't officially supported and has no flag.

So NA data centers just leave English as the default and don't touch any of the other queue language flags - or flip on them ALL like I do - so have the entire pool of the data center to pull from for almost every duty. Whereas a lot of folks on the EU data center may not have turned on the additional language flags (or may not even want to, which is fair) so you're only pulling from a fraction of the population. 30-60 minutes to build a single German only alliance raid sounds about right.