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.