I'm a native speaker, so if I'm speaking, I'm practicing LOL.
One correction of your questions -
What is the most important in learning a foreign language?
should either be
What is the most important thing in learning a foreign language?
or
What is most important in learning a foreign language?
I talk on the phone in English for 30mintues everyday and this helps me a lot.
I study about 50 new words per day and this takes me about 2 hours..?
So to sum up, it would be about 2 to 2 and half hour in total.