Soon I'm going to start working on developing my photographic memory. I'm going to do it for more than 180 days or even years, and over time I'll be reporting on my progress.
In Zevism, there are no limits, in Zevism, we break the barrier of our limits.
Yes, it is true that we can break barriers, but we also have to make sure we are investing our time according to our priorities. If you have harsh negative karma pertaining to Saturn and Pluto, for example, it would not make sense to do a 360+ day memory working whilst leaving these problems totally unaddressed.
That doesn't mean you should stifle your natural interests and hobbies entirely, but don't get carried away with matters that may be considered as wasteful of your time.
Our natural interests are based on our chart, so I would advise you to ask the Gods how to best use your interests. As an example, maybe they will lead you to a different type of Siddhi which also interests you greatly, but provides a better value than just extreme memory.