how well will I speak after finishing duolingo?
how well will I speak after finishing the duolingo tree?
You might be interested in taking a look at a study that was done on the effectiveness of Duolingo. 34 hours of Duolingo was found to be equal to the first semester of Spanish at the university level (which usually takes more than 34 hrs to complete). Read more about it here: http://duolingo.com/#/effectiveness-study
I think speaking might be difficult unless your a native speaker; simply because you are going to be trying to remember the words, the grammar and the correct pronunciation. However I feel that anyone who really applies his/her self should be able to read a different language with minimal difficulty. :D