The instant it takes to drop your car keys from your fingertips to the floor is all the time you have to relay a message to your dog that they are a good dog or a bad dog. This is all the time you have to tag a behavior. Anything after that simply leads to confusion and resentment.
When you are reward-based bird dog training using food, toys or praise, you must be prepared to reward or correct the dog the very instant it presents either a desirable or undesirable behavior. This requires you to be very attuned to your animal. Being able to read and recognize when they are in the thought process of making a good or bad decision is key. For example, when we teach the sit command on a recall (the dog returning to you), we shape the sit through tagging then rewarding the dog the moment it begins to sit (doesn’t need to be perfectly aligned) and slowly building accuracy over time. It’s very common for handlers to over-command, and when the dog finally performs the action correctly, they are left scrambling for a treat and the reward is now too delayed to be of value towards learning.