The actual number of days to harvest varies also from year to year and location to location. It takes anywhere between 58 days to over 100 days to harvest corn, depending upon the variety and the ear size. There are many different varieties of corn, some of which are heirloom and others that are hybrids. The maturity dates are relative to the type. The actual number of days to harvest varies also from year to year and location to location. It takes anywhere between 58 days to over 100 days to harvest corn, depending upon the variety and the ear size.