Actually, as far as Palace runs go, it may not be mechanically impossible. CED Naruto keeps his memories in the repeated days, so if he has some mental barrier that needs to be knocked down, it should hold through to the next iteration. Of course, the Palace could reset. If it's something that could theoretically be banged out in a single day, the Phantom Thieves might have to go through his entire Palace all at once in one day, with the caveat that they've already gone through it before it reset. Then they would have to give him a Calling Card in the morning