Four Days

"Participant YU897 Will Rest For Ninety Seven Hours Before Escorted To The Second Challenge Along With Rest Of Participants!" 

"If Participant Do Not Want To Participate Into The Further Challenges, Say 'Leave' And Participant Will Be Teleported Out," The Mechanical voice said as I was observing the small potion bottle in my hand.

As it said it, the color of the white hall dimmed, and it became creamy, less harsh to the eyes, but other than that, there was no change; the room is still blank as before.

I am not surprised to hear that I will have to spend four days here; some of the Treasure Palaces that had appeared before had similar rules like this.

I looked around the hall for a few minutes and even attacked the walls couple of times with all my strength, but nothing happened to the walls. My attacks were a touch of feather to the walls; not a single mark appeared on them.