How long does it take for the vas deferens to reproduce semen after ejaculation?

Vas deferens is duct. Sperm is produced in the testis, they pass into the vas (1) via the epididymis ; thence to the ejaculatory duct. Most of your semen is produced in the prostate gland (3) ; seminal vesicles (2). Some men are able to ejaculate a second time 15 - 30 minutes after the first. Men tend to produce less semen as they age ; thus take longer before they can ejaculate again. Hope this answers your question.