I started my package with 3 drawn bars from my other hive. When I went back in on day 3 to retrieve the queen cage, I added an empty bar between 2 drawn combs. Then on day 10 after package install, I added another empty bar between drawn comb. I've been feeding them syrup for 30 days, and they have drawn out all the additional bars that I have given them. I will say, on a couple of the empty bars that they didn't get the comb placement just right. Because the pieces were small, I chose to remove them rather than to reposition them. So it's important to check on the bees weekly when the comb is being drawn.