Pros and cons of teaching as a PhD student for non-academic future I started teaching this year. Since at the beginning the idea was just to do exercise sessions and now it starts becoming very (maybe too) time consuming with slide preparation, correction of homeworks and exams, I'm considering the idea to quit teaching. 

My impression is that the time spent teaching/correcting/preparing is affecting very negatively the amount of time I spend in the research and the quality of my work. 

Since from an economic point of view there are not a lot of advantages (roughly +10%), in the principle my idea was to earn teaching hours for a possible future in the academia, even without being sure about my future.

Since I have no idea about what to do after the phd and one of the possibilities is industy I was wondering whether ≈ 200 hours of teaching are seen positively from an industry perspective or if they are totally unnecessary from who is planning a future in the industry.
I think the comments on your question already give a quite clear answer: Yes! Most industries really like someone that can communicate complex concepts clearly, either to management or to their team. Teaching a course is one of the best ways to learn this. 

Personal note: I once had an interview for a relevant, part-time job, next to my Master's. The job I had at the time was as a rowing instructor, with poeple having very different skill levels and ranging in age from 20 to 80. Throughout the interview, we kept coming back to things I learned there, regarding communication, conflict solving, keeping a team together, that kind of stuff. Teaching a class will give you a similar experience in my opinion and will be a very valuable skill for any employer.