Kids who have achieved the rank of Green or higher all take class together. My boys are both already in this class: Thing Two's belt is Senior Green and Thing One's is Blue. Once Petunia gets her Green belt, she will move up from her current class to their class, and all three of them will be done with class in 45 minutes instead of 90 (her current class meets right before theirs.) This transition will mark the first time in the history of our family that the after-school schedule actually got LESS complicated and time-consuming!! Hallelujah.