Let’s assume Edo period Japan had its Earth overshoot day late December. By quadrupling the population as of today this alone pushes this forward to late March. But the rate of consumption in modern Japan is much higher. At a guess, by more than an order of magnitude. So it’s probably in the first week of January. And the ecosystem carrying capacity, particularly the sea, is considerably degraded relatively to the Edo period. So this would make Edo-technology semisustainable population significantly smaller.