Prostate massage often takes time and practise so it's unlikely that you'll orgasm automatically, but if you're teaming it with masturbation then it might well speed things up!
Some men I have spoken to (when they have time!) use prostate massagers for hours to experience an amazing build-up and even multiple orgasm, but you need to be nice and relaxed and able to dedicate some time to it to learn what your body likes and responds to.
Our customer care team are always on hand to answer questions about any product, so don't hesitate to contact them to learn more about your toy. I'm sure members on this forum will have loads of useful tips for you too.