(MC POV)
One billion times.
That was how many times I killed the poor boy.
At first I just killed him a few times, then I started to doubt the words a little and left him alive.
Unfortunately, it tried to attack my disciples so that made me a little angry and I went ahead to torture and kill him for about a few million times after that.
Then it got a little boring again so I froze him and teleported him to another dimension, only to find out that the time rewinds automatically after three hours back to this point again so that was not a viable strategy.
So I tried to let my disciples handle him by giving them OP weapons, which also got tedious after watching them fight him for the fifth millionth time. It doesn't help that I needed to conjure up the weapons and give them instructions every time the world shifted back either.