The time in the space of the old man was so slow that one second in the outside world was a thousand years in that space. So Long Chen was sure that thousands of years had already passed there by now.
He believed his family must already be very strong by now. Possibly even stronger than him. But he was also worried. What if the old man kicked out his family, thinking Long Chen ran away without telling him?
In that case, his family could still be weak and even in danger. He didn't want to spend a single second more than he had to. It didn't matter how many worlds he had to destroy. If it got him home faster, he didn't care, especially now when all this killing was common for him.
Unfortunately, even though he wanted to find a way back, he couldn't. He needed to find a world with life for that, and he couldn't.
Despite traveling through multiple galaxies, he didn't find a single world with life.