The biggest benefit of cultivating with the use of Origin Crystals was that there was no time limit.
The process in which a martial artist absorbed Spiritual Qi and transformed it into Origin Power would require him to expend his spirit to stimulate his Spirit Base to absorb the Spiritual Qi. However, if one cultivated with Origin Crystals, one could skip that step and greatly conserve his spirit.
Thus, the cultivation time could at least be extended to twice or thrice the normal time. One could practically cultivate for the whole day then sleep. When one woke up, his spirit would naturally have recovered already, so he could again continue to cultivate.
This was also why the disciples of great sects could improve so fast. They not only had a large amount of Spiritual Medicine to break through the shackles of their cultivation level—they also had endless Origin Crystals to speed up the accumulation of their Origin Power.