The flap closes immediately after the cat with the associated chip has left. I also have two cats. One eats as long as it has and the other can't eat it all at once, always goes back for a bite. That is no longer a problem. However, I got a separate feeder for each cat. This way you can also control when a cat needs to be given medication or special food. After a short time, each cat knew exactly in which corner its pot was and they no longer bother each other. The flap has also solved the problem of flies in summer, as the flies can no longer get to the meat. Before, I often had to throw the food away several times a day. I can only recommend this automatic feeder!

Thanks for the quick reply!