Given that all of the frames with regular foundation are worker cell sized, I assume (and have read) that bees will tend to draw out drone comb if given a foundationless frame, as they are short on drone cells. Is this correct? If so, do they do it all season long, or just during the spring/early summer, or...?

I got thinking about this when I placed top bars for my TBH on top of a 3" riser over a brood chamber on a strong hive, with thin (1/4") strips of foundation as a starter guide. I was hoping the bees would draw comb on the top bars and get things started for my new TBH. Then I thought: "Poop. They are going to draw all drone comb!"