Would God really have time to spend playing around with 1 single planet when space is so vast and has the possibility of having millions+ of planets?
Try more like a million of millions of millions of stars, and obviously even more planets than that
But IMHO the question isn't whether he'd have the time. An omnipotent God, sure, would have all the time. If anything he does requires any effort at all or any time at all, then you could conceive a god who does it in half the time and with half the effort. Which kinda ruins the superlative.
IMHO a better question would be more like, dunno, why would he care about your opinion or mine? He's got probably billions of billions of sentient people to play king-of-kings with, yet he's described as so insecure that he cares whether ONE person questions him and gets upset about it. Someone so insecure that he'd actually kill a bunch of innocents just to test Job, because he wants to be REALLY sure that Job REALLY loves him, and throws a kiddie tantrum when Job just says he'd like to ask God why. That's not a king-of-kings, that's an insecure teenage nerd.
I mean, seriously, one of the things my father taught me and I'm grateful for that, is the idea that those who really are powerful and know it are not the guys insecure enough to have to prove it at every turn. You don't see the formula one champion trying to keep someone in a fancy car on the highway from passing him by. And you don't see a boxing or martial arts champion have to punch people left and right to prove that he's the toughest son-of-a-witch in town.
Plus, what would it prove? To really show anything at a certain level of power, they need a suitable challenge, not to show they can punch a first grader. A boxing champion would prove something by defeating the challenger who made it to second place in the ranking, not by punching someone way below his level. And ditto for knowledge stuff or whatever. If you're the local chess champion, you don't prove anything by defeating a preschooler and have no reason to worry whether the preschooler has faith in your chess skills or not. You prove your mighty chess skills against someone at your own level.
So really, God just isn't acting his power and knowledge and all. Someone that powerful should not be that insecure, nor feel like he has to show his might by killing some dude who spilled his seed instead of impregnating his sister-in-law.