As title says, I plan to memorize ALL the openings, ...
I spend about 5-10 hours a day studying, just to give you an idea of my dedication.
It would be more efficient to choose a basic repertoire and spend your time studying that, instead.
- Pick a main first move for White that you'd like to go with. 1.e4 and 1.d4 are the two most popular options, though there are other quality choices, as well.
- Pick a defense against 1.e4
- Pick a defense against 1.d4
Studying those three things alone should give you more than enough to work on (in addition to learning basic chess principles, and working on tactics).
I went over 1800 uscf without knowing openings well. I never seriously studied them, that could be why I plateaued early & didn't advance further.