i find it still palateable after 24 hours out, but i never go past that, usually overnight at the most. my partner will let it sit for longer if i dont intervene
the flavor and texture degrade quite a bit even just overnight. if you put it in the fridge right away (in something airtight) flavor and texture stay much more intact. For me i will give it up to 5 days in the fridge before throwing it out.
if i have way too much pizza i freeze slices in airtight bags. a bit of a hassle to reheat, but it comes out almost as good as fresh
too much to eat before it goes bad. i max out at pizza twice a day personally. if i have more than a two pies worth i need to start freezing