Hah. Long ago, at the lovely naive time of Beethoven 10/1 and heaps of attempts at way too difficult pieces, I thought I'd be able to learn it. I've worked rather hard since, and still, no friggin' way.
Grades are not applicable, it's simply a pro piece. My advice is write the title on a post-it and stick it on your piano as a long-term motivation. Long-term being, I'd say, roughly three to eight years, depends on how hard you work.
It might make a good central piece of an ambitious university audition programme, if you -really- master it. At the conservatory entrance exams over here, it would be probably considered somethink like an overkill.
You're welcome.