Tide.

After an hour, the chopper landed on the helipad of Dao Courtyard Mansion. Atsuji Kurogame got off first, followed by the others. Yang Dao did not hurry off to get off the helicopter. He channeled his source energy inside the spatial pouch and moved his thoughts. The two leopards appeared in front of him inside the helicopter cabin. 

The two little furry things have grown a little too much. By Yang Dao's estimate, he spent only two weeks inside the sacred realm. After he came back, he found he had spent two months inside. The time inside the sacred realm differed from the mortal world. 

One day inside a sacred realm was equal to four days outside. The ratio was 4:1, so, by this equation, two weeks inside is equal to eight weeks outside. The cubs have been staying on the island the whole time. The energy of there had proved great nourishment for them. The cubs were now as big as an adult and to think that they will grow even more in the future.