Whenever I use wean flaps - it does seem to help the calves out quite a bit at weaning. Mommas still seem to struggle, but the calves do better. The game is always that they don't all stay in - and I use the expensive ones. So it becomes a race against time - the earlier I can separate them after installation, the more that stay in for the duration. The instructions say 4-7 days. 7 days seems really long. How long do you all who use these flaps wait?