After confirming that he needed to kill more beasts to complete the quest from his system, Randy was resolved to complete it no matter what as the system's reward might be something valuable that he could not give up on, and if he did, he might end up regretting his decision in the future.
Therefore, he had been clearing the dungeon over and over again without stopping to take a break to rest. The only time he rested was when he went inside the safe room for a few minutes to eat his remaining rations and drink some water to relieve his moderately parched body.
…
A few hours later.
At this point, Randy was still fully immersed in killing the beast without stopping, up until the system flashed across his vision, announcing something to him.
[[The Quest, 'Kill 1000 Dungeon Beasts' have been completed]] The system stated.