Well, my top bar hive is 'up and running'--it looks great. It has 5 bars with a good amount of wax drawn and 2 are starting. I hope to be able to go in there Sat. and add more bars... Where do I add the new bars? Front of the hive or to the rear? They started in the back and are working forward.. So, it seems like I should just push the drawn bars toward the back and add empty / new ones in the front-- extending the brood chamber.. How long should I leave the front entrance reducer on?