I have six hives in my backyard. A three-year-old hive was very strong in the spring. During late very early July, I noticed the bees at that hive were very listless compared to the other five hives. In mid-July, I checked and did not find a queen, so I ordered one from Kelley Bee. I installed here on August 1. After three weeks, I still did not find any brood. I spoke with Kelley and they said to wait longer for the queen to start. They finally sent a replacement queen six weeks ago and I installed her. We found the old non-laying queen and removed her first. I checked in a week and the new queen was released fine and the activity seemed more normal again at the hive. I just went into the hive yesterday to check for honey stores for winter. The population of the hive was good, but still no brood. Could the bees have lived more than three months over summer without a queen or did the new queen probably lay and she just stopped this fall? I live in Cincinnati, OH. The other five hives have larvae and capped brood so those queens are still laying fine. I have always read that bees live only about six weeks other than over winter. If this is true and my new queens did not lay, shouldn't the hive be dead now?