Re: So many bees all of the sudden!
It's a normal daily thing, during the warmest parts of the day in the afternoon. It is orientation flights for the younger bees that have emerged 10 days before. Those bees will take off from the landing board in reverse, and make ever widening horizontal circles, learning the location of the hive. There is also cleansing flights going on where debris is being carried out and also the bees go pee. Going pee is in vertical circle flight and you can catch the drops in the sun if you look just right. This creates quite a large cloud of bees in front of the hive for 20 minutes or more and happens every day the weather is warm enough. During the warmest parts of the day is when more brood can be left with fewer attending bees on the combs.
20+ years, raise my own queens, feed when needed. I treat, but have not perfected varroa management yet.