3 on 1 | 300 on 1

I just noticed everybody's gone besides us 4. I guess Vanderdecken and Aleck evacuated the building.

I was at the top of the stairs at 4:30 when I saw the evil trio at the bottom. "You're pretty fast, Ben!" Collin conceeded, but I'm afraid we've got one nasty trick up or sleeves. And almost symbolically, he pulled back his sleeve. Tad and Gregory did the same. Underneath the sleeves were time-machines.
"Oh shoot." I said under my breath.
"So you know that your defeat is inevitable, I shall explain it to you." Gregory said. "These time-machines are special. They let us to preset and lock certain coordinates, so that using the multiplier effect is easier. That is, so that we can duplicate ourselves."
"We shall act in the following way," Collin continued, "our machines will go to 5 PM, wait three hours, and then go to a deserted island. On that island is everything we need to recover. After 24 hours, it shall beam us back -well rested- to 5 PM today. It will do this 100 times, erasing our memories after we get sent back each time so that there will be no anomalies."
"Of course," Tad broke in, "all you will see is that there are 100 of each of us for three hours straight. There is, of course, no way to avoid it."
They all said it together, "defeat is inevitable." And with that, they set the algorithm and disappeared.
I have been racking my brain (and my laptop) for a solution to this problem. All I've come up with is that if I destroy the  first ones, all the rest will just come back dead. The problem with this is that I will see them all alive. Therefore, a time continuum is created in which they essentially become invincible due to a paradox. This is all stuff I've learned from Ludwig. Unfortunately, I'm afraid it can't serve much use.

And now, it is almost 5....