After some time since he had finished his advance, Minos waited in that cultivation room until finally, all the energy of that King-grade medicine was absorbed by those 130 soldiers.
On the other hand, since he had already finished his advance, most of the soldiers who were there to observe him had already left to fulfill their duties within the headquarters or deal with their personal affairs outside this place.
After all, while there was a possibility that they might gain something by watching Minos' advance, the same was not true for the progress of those 130 soldiers. As such, it was not worth it for many of those people to continue there.
Besides, some of those people had made gains from watching Minos' advancement. Hence, they were very eager to cultivate or train their techniques!