English Lesson, or Chatting with a Friend?

I've just finished an online English lesson with my teacher who lives in Thailand. One lesson was supposed to be within 25 minutes, but we talked for nearly 40 minutes. I always enjoy talking with my teacher, because he has various kinds of experiences and insightful perspectives on any topics. I make an appointment of his lesson every Saturday. This is not just an English lesson, but an indespensable time with one of my best friends.