The concept of immortality in Taoism is not the same as the physical immortality that we often think of. Instead, it refers to the cultivation of the spiritual essence within oneself, leading to a state of eternal harmony and balance. This process of cultivation is known as "neidan" or "inner alchemy" and can take a lifetime to achieve.

Taoist immortality schools believe that the human body is a microcosm of the universe, and by aligning oneself with the natural order of the universe, one can achieve immortality. This involves purifying the body, mind, and spirit through various practices such as meditation, breathing techniques, and physical exercises.

The time it takes to achieve immortality through Taoist practices can vary for each individual. It depends on factors such as one's dedication, discipline, and understanding of the Taoist principles. Some may take years or even decades to reach a state of spiritual immortality, while others may never achieve it in their lifetime.

Furthermore, Taoist immortality schools believe that immortality is not a destination but a continuous journey. It is a state of being that requires constant cultivation and maintenance. Therefore, even if one reaches a state of spiritual immortality, they must continue to practice and align themselves with the Tao to maintain it.

In conclusion, achieving immortality through Taoist practices is a lifelong process that requires dedication, discipline, and a deep understanding of Taoist principles. It is not a quick fix or a destination that can be reached in a specific timeframe. Instead, it is a continuous journey towards eternal harmony and balance. So, the key is to embrace the process and allow it to unfold naturally, rather than focusing on the end goal of immortality.