How long does it take for a single sperm cell to be created, move through the reproductive system, and be completely ready for ejaculation?

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How long does it take for a single sperm cell to be created, move through the reproductive system, and be completely ready for ejaculation?

And when a man ejaculates, does he release all of the sperm stored in his "reserves"?
- age 18, Ohio

For men of normal fertility, sperm creation is a constant, ongoing process. Millions of sperm cells are created each day in the testes; they mature in one to 3 months, after which they're ready to be ejaculated. So, since there are always sperm cells being made, there is a lot of overlap between your "loads." Once one has been released, another should not be far behind.