How long does it take latex paint to cure?

Although it may feel dry to the touch, it is only surface dry. Depending on both sunlight and humidity, oxygen slowly penetrates through thickness of paint stroke or roller coating. Incredibly, this can take several days for non-oil based types such as latex/Alkaid/rubber paints to fully cure thoroughly down to applied primers. Primed surface usually adds 1-3 hours before painting. And oil based paint drying time can take up to 3 weeks and as much as 30 days to fully cure. Fully cured paints of all the market varieties allow mild surface cleaning thereafter without damage, except in use of abrasive type kitchen/bathroom household cleaners that will remove outer layer of protective surface. Such as destroying gloss from the very best and most expensive brands of paint. That warning always appears somewhere abstract on can label of the manufacturers directions for use.