The length of time it takes to be able to play a good tennis rally can vary depending on a variety of factors, including your natural ability, level of athleticism, previous experience with sports, and the amount of time you are willing to commit to practicing and training.
With consistent practice and proper instruction, many beginners can start playing basic rallies within a few weeks or months of starting to play tennis. However, becoming proficient at rallying with speed, accuracy, and consistency typically takes longer, and can take several months to a year or more for most players.
To improve your ability to rally effectively, it's important to focus on developing your technique, footwork, and overall fitness level. This can involve working with a coach or instructor, practicing regularly with a partner, and participating in drills and exercises designed to help you develop your skills.
In addition to physical practice, it's also important to develop your mental game by staying focused, positive, and calm on the court. By committing to regular practice and developing a well-rounded approach to training, you can improve your ability to play a good tennis rally and become a more skilled and competitive player.