Sounds like he's going to have to purify each palace separately. I'm not sure if there's enough resources in the entire kingdom to drag all three up to 9th grade... In a similar vein, if he has to get both to 7th grade just to match his fiance's cultivation speed, then he's going to need to get them even further than that to surpass her, which is the minimum he needs to not die. I wonder how he's planning to afford that. Or is he hoping that the third acquired resonance will allow him to surpass her cultivation speed and reach Duke before his lifespan runs out? Assuming he can even get his third before becoming a Duke that is. I honestly can't remember. So, he's planning to tell people that he opened his second palace before becoming a Duke? That sounds like it'll lead to trouble honestly. Though, if that is his plan, then he should at least drag it up to a fourth grade resonance first. It'll be embarrassing to go public with it as it is now.