Translation of usefulness in Spanish

How long have you being teaching Russian and why do you want to learn Spanish? Since when do you learn it? Are you traveling often and if you do in which countries? Are you from Moscow or St. Petersburg?
I wanted to post a comment to your blog, and just after this email there was the power outage - so I am sending here the full original email once again. And thank you for your kind words.
I come from Bavaria and live in Munich. How are you? Sorry that I am replying your email just now, but again I am covered with work. My boss is back from vacation and gives me many assignments.