264 Hell

238 days after the apocalypse has come and 262 days before the first tribulation to hit the world. 

At that time, thousands of abyss gates all over the earth will open and hundreds of thousands of monsters will come out from every abyss gate and flood the surface of the earth. 

In Alex's previous life, the gate of the abyss would be partially open after the first year so that the next monster that came after those critters would start to become a threat. While the main monster will appear on the 500th day. 

In order to raise his realm and cultivation level, Alex planned to enter and explore the gate of the abyss. But the natural opening time of each gate is different.