So, I was just wondering, in tyron18's new run, he does that one harder moon skip, and I was wondering how much time it saved. thanks.

Good question! I'm guessing that going on to two different walls in the easier moon skip will waste a few seconds, and by doing the other moon skip he was able to get to the top of the moon cave faster. But again, this is just a guess.

1 walljump moon skip saves around 2 seconds if you do it with a vault instead of a sideflip done by tyron and many top runners, which saves around 1 seconds. For the record it isn't much harder ;)