FAA studies have proven over and over that the time necessary to learn the skills and knowledge required to pass the FAA knowledge exam and practical exam ("checkride") varies with the individual and is based on frequency of training.
The next big question is, "How long will it take?" FAA studies have proven over and over that the time necessary to learn the skills and knowledge required to pass the FAA knowledge exam and practical exam ("checkride") varies with the individual and is based on frequency of training. The key there is study and retention of skills.