His estimation was a bit off, only on the morning of the next day, on the eight-day after he arrived at this shrubland, that his Warrior class reached level 29. He was only a single level less from gaining access to the Elite class.
During the entire week he was grinding in this place, he also continuously summoned Runestone of Luck when he killed enemies. Although there was no boss here, he still summoned it. His purpose was to increase the proficiency of his runecrafting skill.
But because of this, he also found out that, unlike the other lifestyle runestones, this Runestone of Luck had a hidden cooldown time. He could not just keep on summoning every time he wanted. If the luck increase took effect when an enemy was killed, he would not be able to summon it again for some time. After several tests, he found out that the cooldown time was one hour.