How Is That Possible?

"You are now at the level of a high goddess? How is that even possible?" The Emperor who was once an immortal and clearly understood what it means for an immortal to reach the level of a high god/goddess in their cultivation found it hard to believe that his daughter had sailed through that stage. Back in heaven, it always took cultivators thousand of years to reach that stage. He could even recall how hard it was for him to passed that stage when he was in heaven. He had to go through heavenly tribulations before he reached the stage of a high God but the princess just reached the stage that took him thousands of years like it was a piece of cake.

How is that possible?