Board Thread:Episode Discussion/@comment-25959945-20170809004218/@comment-4010415-20170809005544

Most episodes of volume 1 were 5 or 6 minutes long, yes, but ever since volume 2, each episode is at least 12 minutes long. And I'm guessing you're watching the TV edition of the Japanese dub, which is the one where they combined the episodes into longer episodes for TV and cut out some of the scenes. Though, Japan also has each volume premiere as a movie in movie theaters, so that's cool.

Some of the dialogue is bound to change when they make the Japanese dub, just as the same sometimes happens for English dubs of anime. There are some jokes in RWBY that revolve around wordplay, so when translated into Japanese, those jokes would become nonsense rather than jokes. I haven't watched much of the dub, but I did notice that, in Round One, they replaced Nora's burp sound effect with having her say "Guuu" instead, which I'm guessing is a cultural thing.