i completed my first italki Challenge today. I must admit I don't feel like I made much more improvement than I would have in a normal month. Nothing too dramatic That could be measured. Normally I would probably do about eight hours a month, approximately half in Cantonese and half in Vietnamese. By the time I'm done with this month I will probably have almost done 15 hours total.  I think doing more classes did not necessarily mean I spent much more time learning my languages because I spent less time preparing for more frequent classes. I just didn't have enough time with other things going on. I probably spent more time than normal speaking if anything, whereas normally I spend lots of time practicing listening and memorizing vocabulary. One positive thing is I met some good new teachers I hope to find a way to continue to work with in the future. I don't think I want to try it again if it's 20 hours, but I might do it for 12 hours.

How do you know when you're at the stage that you should start having classes purely in the target language?