You are a true genius the likes of Reed Richards, Tony Stark, or Victor von Doom. You have an incredible ability to process and visualize information, a perfect memory, and an incredible capacity to acquire knowledge.
With reference materials on hand, you can acquire knowledge as fast as you can read. Knowledge builds on itself, the more related fields you master the better understanding of them you develop. You can even discover entirely new fields with some effort by cross-referencing information you already know. While the most obvious application of these abilities is in science and technology, you are by no means limited to it.
One to three days of study could allow you to learn any skill, be it martial arts or underwater basket weaving, to a point where you are proficient with it, the more you practice any of your skills the better you become. Your rate of progress is dependent on the difficulty of what you are studying, fields such as magic can still take you many decades to master completely. You are however limited to what your body can handle, this power by itself does not allow you to surpass your physical limits or grant you the ability to wield supernatural powers.
When you acquire new skills and expertise, you will never forget or become incapable of your peak accomplishments. With time you will inevitably become a veritable Swiss Army Knife of incredible scientific knowledge, incredible feats of physical skill and much more. You can reach the power of Atlas in around a decade of study and practice. The more time you dedicate yourself to it, the shorter this time becomes.