It will take at least 10 years, if you have a good coach. The absolute top players have been playing since they were kids, and have had constant coaching since then.
Also Spain and Argentina have coaches with experience, who have been playing and coaching for decades.
Since the sport is relatively new in other parts of the world. They would need to have a Spanish/argentinian coach, to teach their young players and develop them.
If you have tennis experience, the development could go a bit faster.
In my country, padel boomed 5 years ago, and the best padel players now were playing tennis before we had padel.