In his case, it took him 22 years to advance from the first transformation of the second mortal coil to the tenth transformation. That is the time it should take him to complete each transformation in the third mortal coil.
These 22 years were because he used pills to extend his mental energy and increase the time he could continue to cultivate. There was also the boost from the Mountain Karma divine ability and the high concentration of mana in the environment.
If he can't maintain the conditions that helped him achieve the entirety of the second mortal coil in 22 years, it will take him longer than that to complete a single transformation of the third mortal coil.
But if he can maintain these conditions and even improve on them, for example, by cultivating in an environment with better mana concentration, then he can shorten that time greatly.
Aside from the environmental conditions, if everything remains equal, his cultivation speed for each transformation should be cut by half because the quality of his life seed has improved to rank 3 after establishing his foundation.
This would have been the case if he had forged his foundation with a low-grade rank 3 armament like everyone else. But he had used a top-grade armament, which is 8 times more efficient and faster than that of a low-grade armament.
So the time for him to complete each transformation of the third mortal will be 22 divided by 8, which is 2.75 years. If he can maintain this rate, it will take him just 27.5 years to reach the peak of the third mortal coil.
This kind of time is very impressive even if it is considered as the time it will take someone to complete the second mortal coil. After all, it takes an average person 50 years to complete the second mortal coil, so the time of 27.5 years is clearly above average.
Now if that time is considered for the total amount of time it takes someone to complete the third mortal coil, it will be more impressive because the average time it takes people to complete the third mortal coil is 100 years.
The more he thought about it, the prouder he became. He shook his head and said to himself, "And I haven't even considered the effect of the high concentration of mana in the inner sect."
The average speed of transformation of the second mortal coil in the sect is 4 years, or 5 years like outside of the sect. This is because of the higher concentration of mana available to everyone in the outer sect.
So in general, it takes a disciple of the sect 40 years to complete the second mortal coil. This time is divided by 2 to calculate the time it takes them to complete one transformation in the third mortal coil.
So it should have taken the disciples of the sect 20 years for each transformation of the third mortal coil and 200 years in total. But it doesn't take them that much time because of the high concentration that disciples of the third mortal coil get to enjoy in their inner sects.
This concentration of mana literally shortens the time it should take them to reach the peak of the third mortal by another half. So they need 10 years, not 20 years, for each transformation of the third mortal coil and a total of 100 years, not 200 years, to reach the peak.
By this calculation, the time it will take him to reach the peak of the third mortal coil can be expected to shorten by half because of the higher concentration of mana in the environment.
27.5 years divided by 2 will be 13.75 years. So the true comparison of the time he will spend at the third mortal coil compared to those of other people in the inner sect will be 13.75 years to 100 years.
In his humble opinion, he thinks achieving the peak of the third mortal coil in 13.75 years of time will be impressive. And he is being very humble about it.
He said with pride, "It was worth it to stress myself over the quality of the armament and work so hard for it."
While he was stroking his ego, Roar nudged him with his wet nose and said, "Can I go to play?"
This action brought Arthur out of his daydreaming. He rubbed Roar's head and said, "Yeah. Go play. But remember to be careful. The inner sect is clearly more dangerous than the outer sect."
Roar nodded earnestly and said, "I will be careful."
Then he turned into a stream of light and went away. He was clearly eager to explore his new environment.
Arthur looked at him go and said, "He should be fine. He is fast, so he should be able to escape easily."
He wasn't lying when he told Roar that the inner sect was dangerous. The inner sect is indeed dangerous. It is full of various wild creatures that hunt and attack the people of the sect at first glance.
The inner sect is not a mountain range like the outer sect. It is mostly a plain.
The plain has five ecological regions. There is the central zone, which is a jungle. The other four regions are around the jungle and form a ring around the border of the inner sect.
These four regions are the sandy and windy desert, the hot mountainous lava region, the icy snow caps, and the vibrant lake. Each one of them is large, but they are all present within the inner sect because the inner sect is large enough to fit a small kingdom in.
To be fair, the regions aren't natural. The four external regions are artificial and were constructed by the sect.
The conditions of the various regions are different, but one thing they have in common is that they are teeming with hostile creatures. This too was an intentional arrangement by the sect.