The Cave

  'I don't think much time has pass. It is easier coming back than going there' he mutters to himself. 

There is a trace of helplessness in his tone of voice

It took him probably only a few hours to travel back to Pandemonium when it takes probably half a day to travel to the black hole

Why then it is so fast? Why did it not take him this small amount of time when he was flying toward the black hole?

Azief uses some kind of methods of travel that is akin of teleportation when he is going back home. 

To be more accurate, he folded the space between his current position and the place where he wanted to go

He could not fold space to a place that he had never been before. That is why he did not just fold space and go to the black hole before.

Because he had never been to the area of the black hole. 

Of course, this method would not work so well if he wanted to cross to other worlds like this