The amount of time it takes for a parakeet to learn this trick varies depending on the individual bird. Some parakeets may learn it in a matter of days, while others may take weeks or even months.
There are a few things you can do to help your parakeet learn to jump on your finger. First, make sure that your bird is comfortable with being handled. You can do this by spending time with your bird, petting it, and talking to it. Once your bird is comfortable with you, you can start training it to jump on your finger.
To train your parakeet to jump on your finger, start by holding your finger in front of its beak. If your bird is interested, it will likely hop onto your finger. If it doesn't, don't force it. Just keep trying and eventually your bird will learn.
Once your bird has learned to jump on your finger, you can start to vary the distance between your finger and its perch. This will help your bird to learn to jump longer distances. You can also start to move your finger around, so that your bird learns to jump in different directions.
With a little patience and training, your parakeet will be able to jump on your finger in no time.