In the end, Dilan was fully aware that the advancement mission to the fourth Tier could take a long time.
He came up with many assumptions after he saw the four missions which the Ancient Paths of Advancement unveiled to him and came to the conclusion that all missions were quite chaotic.
The Abyss difficulty mission was something that might actually end up being impossible to solve if he were to be unable to finish it before the Fourth Awakening.
As for the Race Purgatory and the Planetary Conquest, it was something that didn't provide a lot of information. It was quite obvious that he would have to annihilate a race or conquer a planet, but that was already the limit to what he received in terms of information.
Unfortunately, that was still more than he got to know for the Divine advancement mission Path of Preparations.