What is a respectable level in duolingo and has anyone finished the tree yet?
Has anyone yet finished the entire tree for a particular language? Also; what level is a respectable level? 5+? 10+? 15+?
There is no respectable level; it only matters that you're continuing to learn and love to learn, whether you're at level 2 or 20.
There are people who have finished a tree, or even multiple trees, but at what level you are depends on your style of learning. I have seen other users having completed their tree at level 15, while I am not even half through at this point. I revise a lot and progress slowly, because I fear I will forget vocables I have not hammered in my brain over and over. Others plow through the tree at impressive speed, and it's equally okay if it works for them.
Just try to find out what works for you, what pace is fun for you, and keep on learning steadily. You will see how you progress and how long it takes you to complete the tree at your own pace.
Sakasiru is correct. It all depends on your learning style. I finished a tree and I am at level 16 because in my style of learning I like to go through quickly once and then go back and focus on the areas I consider most challenging. My advice similar to all the other respondents is not to focus on the level, but rather enjoy the experience, practice speaking with every opportunity you get.
I'm on level 10 but I've only done about an third of the tree (just past the second padlock). At the start I progressed very quickly doing multiple skills in a day but now I only really do 1 max. per day. I think this is because like sakasiri I like to revise things over and over until I completely understand them. :)
Like others have said, I think it just depends.
I am level 13 Italian and I am about exactly half way through my tree. I am level 6 French but not even a quarter of the way finished with it. For Italian I've seen people who are much higher levels than me but are not as far and conversely I've seen people who are nearly done with their trees but are my level give or take.
I study the two languages very differently. Italian I am doing all the time, I try to invest as much time as I have available in a day to do it. I progressed really quickly at first but now that it is harder and I am making so many more mistakes, I am progressing much more slowly and my coins and word counts are not a very accurate indicator for the time I am putting in. The trade off is that the learning is now its own reward for the most part.
With the French, I am only doing about twenty to thirty minutes a day. I try to make sure I do some every single day but it is not my main focus. There have been two or three days where I've only done the tiniest bit just to maintain my streak. Even so I am starting to learn more and more of it and feel pretty confident about it.
I'm almost done with my French skill tree and I'm on level 12. My goal is to get through an entire skill every day, which I've been doing pretty well. I started in June. I'll probably be done in less than two weeks now, and by then I'll probably be at level 13. There are lots of people who have twice my level in the French skills, even though I've completed more than some of them. I don't review a whole lot - I find French easy. I guess it depends on what you like to do.
I finished my Spanish tree at level 12. Duolingo levels indicate how many tasks you have completed on the site successfully, including review lessons and translations, not your language level. Thus someone with a high Duolingo level probably practices a lot, which is a very respectable thing, but it doesn't necessarily mean they have better mastery of the language than someone with a lower score. And a person with a low score may or may not have practiced a lot too, depending on his or her success rate.
So, yeah. What everyone else said. Set your own goals! Learn! Don't worry about it!