He asked about their experiences when they were stricken by the disease. All of them expressed similar ordeals. They were awake but were as if trapped in their own bodies. They experienced hallucinations of every kind, sometimes as blurry as a dream, another time as vivid as reality. While not all the hallucinations were pleasant, there were some moments where it was like having a good dream as well.
All in all, the period by which they had the disease was not a really torturing moment. There was no aftereffect as well, the constant HP decrease stopped once they woke up. They even felt refreshed as their bodies had rested for a few days.
Somehow the disease did not sound as bad as it is, Jack thought. Was it truly an emergency? Why did the quest give him a time limit of two days? Maybe it was because this world system knew he had to leave already with the Duke's army after two days?