The best time to level a yard is in the spring when the soil is an ideal mix of moist and dry. Completing your leveling project early in spring also reduces the chances of erosion damage from water movement through the spring and summer.
The average time to level a yard is five to six days. Smaller yards and projects may be completed in as little as a day, while larger projects may take up to a week.
If you only need to regrade a small area—for example, around a mailbox—DIY resloping may be manageable. However, major releveling projects such as resloping an entire yard typically require a lot of labor and heavy equipment operation, which is generally best left to the pros.