Bonus build counters are used up even when not building. This has an effect when lacking money for the next building - say, I start the session with 500 gold, but need 2000. After answering, say, 50 cards, I can now order my building - but I've used up 50 of today's full-worth turns, and in 50 more cards I'll run into the decreased building speed penalty.
Not sure if you count this as a feature or a bug
Not sure if you count this as a feature or a bug