Review Detail of banner_Destroyer in Magic ring

It would have been great if the author could have explained the time dilation between game world and real one as it's not making sense coz the 8hrs of sleeping time of game world seems equivalent to 16hrs of real world when mc is in real world. similarly, when mc is in game world 16hrs of game world is similar to 8 hrs of real world. This seems a bit contradictory. further, when is the mc sleeping?