The practice of Ham-Sah does not require three days to activate the sexual energy in order to "ignite" it.
Whenever you inhale the prana or life force, imagining the sexual energy rising from the testicles or ovaries to the brain, you are already igniting that energy through the power of your concentration, imagination, relaxation, and prayer.
However, single people who practice Ham Sah will have little fire to stimulate the sexual energy.
While effective, Ham Sah is more powerful and the sexual energy truly becomes ignited through sexual alchemy.
Ham Sah is a perfect practice of transmutation for single people, who can learn to handle the fire of a candle (individual) before working with the fire of a sun (matrimony).
As Jang Mi stated, you can spend as much time as you want being fascinated with sensations or with psychic forces when the energy rises up the spine, but this is not the focus of the exercise.
The Kundalini is different. When the Kundalini rises up the spine, there are noticeable experiences, powers, virtues, abilities, acquired, due to profound inner meditation.
However, the work with Kundalini is laborious and slow, rising in accordance with the merits of the heart.
Students have different needs for raising the sexual energy effectively.
Some people are more degenerated than others and need more time with these practices in order to clean the nadis and perfect the flow of chi (sexual energy) through the vital body.
Therefore, there is no specific number that can quantify spiritual development, since each situation, person, karma, needs, etc., are different and unique.
For thirty years I sought God. But when I looked carefully I found that in reality God was the seeker and I the sought. -Bayazid al-Bastami