I have already noticed my mowing time has been cut down a little already. lol I have always wondered about that. The outside seems dry and ready for traffic but it is common since to know that the middle isn't ready. That might explain why the exiting concrete was 9" in places and WAS CRACKED!!! I find that hard to believe but it cracked. I figure a big heavy truck has pulled upon it one time or another but the entrance driveway ISN'T cracked. ???