Caleb and Aiden came back six hours later together, they hadn't found anything yet but they were already ready to leave again, Liam handed them the last six worlds Celia had had time to put on her list.
Afterwards, if Celia did not wake up, they would have to choose some themselves and try their luck. Fortunately Caleb and Aiden didn't need to rest, so they could visit a maximum of twelve worlds per day each.
Two hours were more or less the time they needed to move through all these small worlds and use their sense of hunter to see if they perceived Celia's spiritual energy.
They had to be careful though because since Celia's body was in a coma, her energy signature would really be very low.
So they didn't waste any time, they stayed in the dimension just enough time to collect more red papers and left again right after to return to the secluded place of the forest they had used the first time to open a transdimensional portal.