Personally I love the length of the tree and could even do with it being made longer. :) Compared to doing enough to become fluent in a language, it's still very short.

English-German:

• 123 Skills
• 462 Lessons

German-English:

• 57 Skills
• 290 Lessons

Portuguese-German:

• 72 Skills
• 349 Lessons

Part of it could be how long each skill is, meaning how many lessons each skill has. The French tree only has about 80 skills but many of them are 8 or 9 or even 10 lessons long. I don't remember that many long skills in German tree. So if you want to better compare trees you have to compare the number of lessons not the number of skills. Also the number of words of course... Even then the German tree might be longer but not by so much and so what. It means we have more material for practice :-)

It was updated and reorganized over time and it grew quite a bit (the last update was big). Here you can see a screenshot of the tree like it was 3 years ago (almost half as long as today). Other trees will be improved as well, it just so happens that German received this kind attention before the others :)

Because you learn more

I always say 'try the norwegian course'... So I'm sure you will realize what actually a 'tree longer' looks like... About or better over 3,500 words.

I'm hoping for it to get longer. I've been finished forever and almost (2813) have all the words I read that we get (2860). I wish they'd give me the rest soon. But I guess when you're repeatedly strengthening it just takes longer and longer to get new ones.

each lesson done correctly should take about only 5 minutes so if 462 lessons x 5 minutes = 2310 minutes or 38.5 hours...so technically in a theoretical situation you could finish the german tree in roughly over a day and a half if you went non-stop ;)