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The length of time it takes to aerate a lawn mostly depends on the yard's size. Generally, a lawn care professional can aerate a lawn that is 10,000 square feet in size in about 30 to 45 minutes. This process may take additional time if you have a heavily sloped or uneven yard, and it may cost extra for the lawn care pro’s labor and time.

Watering the lawn after aeration is crucial for getting the most benefits out of it. Not watering the lawn enough will cause the efforts of aeration to be in vain. Light and frequent watering will prevent the soil and grass seeds from drying out, but too much watering can create a muddy mess and wash the seeds away. Watering twice a day is a good benchmark.

Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

While your lawn will reap the benefits of core aeration faster than liquid aeration, the liquid solution will last longer and have more cumulative effects. If your lawn is in really bad shape, try both. By creating holes in the soil with the core aerator, you’ll make it easier for your lawn to absorb the liquid aerator solution. You might have to apply the liquid aerator several times during the growing season, but again, the positive results will be more cumulative than with core aeration on its own.