How much is too much?

I've never had an orgasm before. My boyfriend suggested me getting a vibrator, so I ordered one and it came in during the weekend. 
Oh. My. God. The world is upside-down now. The second day I had it, I was using it and had the most intense orgasm that it shifted my visible color spectrum.  
Question is, how much is too much? I've been using it so much that I must seem like a sex addict. But it's only the 3rd day from discovering what an orgasm feels like.