I found a swarm on a fence post yesterday, so brushed them into a 5 gallon pail and set up a 10 frame deep hive. I don't have any drawn comb, so I sprayed some syrup with Honey Bee Healthy on the frames, put a couple drops of lemon grass oil on the top bars, installed a top feeder and set the entrance reducer on the small opening. This morning 90% of the bees were hanging on the outside of the hive, so I brushed them back into the pail and dumped them back in the hive. I added a second 10 frame box to be sure they had enough room(about 3 gallons of bees), and blocked the entrance to keep them in. It will be in the 80's today, so how long can I leave the entrance closed. Any other ideas to keep them in the hive?