Refining a Lifebound usually takes more or less time depending on what kind of creature one chooses as their Lifebound, and their strength.
Choosing a Demon Beast of extraordinary birth and powerful bloodline will certainly make the refining difficult. Conversely, if one picks an ordinary Demon Beast, the process will be relatively simple, as ordinary beasts have neither the strength nor soul fortitude in comparison to those born with bloodline inheritance.
However, Qin Feng was an exception. With the help of the Demon Refining Pot, he could easily refine the Ruyi Golden Snake into his Lifebound Spiritual Beast.
As for the disciples from the line of Creation Peak, it was to one extreme or the other.
