How to regain sperm in body? In my body there is low amount of semen I want to increase volume. How much time would it take?

Sperm is. Produced continuously. Why do you want to increase the volume? What purpose do you think it will serve? How do you know there's anything wrong in the first place. Don't get your medical information from friends, tv or the internet. Let your body be as normal as it can be. Stay healthy and avoid alcohol/tobacco, opiates/anabolics.