I was messing around, playing as Ganan vs. a level 9 Kirby. In the animation of getting off the ground, kirby did his Rapid Punch Neutral A and instead of being knocked back or being able to even move, Ganan was frozen in place. If Kirby didn't randomly stop doing the attack I'm pretty sure it would have gone on forever considering I was at about 110% and wasn't having any knock back.
It was also on training room level with items turned off if that helps.
It was also on training room level with items turned off if that helps.