Timed practice: too little time
I know that this issue has been raised before. But I really like the competition when practicing. So I do not think that this item should be removed but modified. Why not set the timer at 1 minute instead of 30 seconds. That would already greatly improve it.
Of course some time you have one or two long sentence in a time practice session, but it's even more challenging. I finished two trees and it doesn't occur so much for this languages and it's generally doable (even if sometimes I have to think about the sentence in French (from English) to translate it to Spanish at the end).
I really think there wouldn't be any challenge with one minute (for this amount of questions). At least for french <-> english and spanish <-> english. But maybe the german case is special and some additional time could be, but multiplying it by two...