For reference 3 week Iraqi air campaign had favourable land basing, 5 carriers, doing uncontested runs. Napkin math extrapolate to PRC size and you're looking at 5 years if US can sustain unsustainable tempo and PRC barely shoots back. Double that if US has to operate at standoff range where most of sorties goes to tanking/defensive air. The scale of PRC is massive.
PRC MIC industry is in the EAST far inland, specifically to account for US standoff range, i.e. rapid dragon with even JASSER would have to launch over mainland soil to hit. Can do even more extended AGM156Bs with 1900km range, but still has to be launched within PRC A2D2 1IC bubble, and they weight 5x more, i.e. can only fit lol10 in C17... all of a sudden you have a vunerable platform + missiles worth 400-500m trying to drop ordinances in area PL17 is designed to defeat. This is without mentioning PRC likely has / at least demonstrated to have capability to move MIC underground, see third front.
PRC has enough domestic oil production 4+ million barrels to run military AND industry with transport rationing.
But really what you're missing is if US starts hitting mainland targets, PRC will hit CONUS targets - they're pursuing conventional global strike. Their rocketforce platforms are increasingly dual use for reason. Reality is US is a net oil exporter in the same way Saudi is - i.e. it doesn't matter having resource autarky because extractive infra can be hit by Houthi drones. Era Fortress America is ending/over. PRC hitting 300 refineries and LNG plants cripples US homefront as much as much US trying to blockade PRC energy. And if we get to that point, then it's a matter of who has more distributed energy infra (i.e. renewables), and capital stock, excess construction capacity to survive the attrition game.