I'm a new E4, so I obviously have promotion on my mind. I have a good amount of experience coming into Meta (~5 YOE), so I want to move more aggressively with this promotion. If I work 40-45 hours per work with very good work ethic, what's a reasonable target to hit for the E5 promo?
It really depends on how much you are into the Meta culture and mindset. You have to make E5 impact and demonstrate E5 behavior before you can get that promotion.
Meta is not the place where you can count on your YOE and assume you can get a promotion by accumulating experience year over year. Meta doesn't recognize experiences and only recognizes impact. As the level number increases linearly impact is expected to scale exponentially. That means behavior changes and new skill adoption are needed for E5. The most important one is shifting from owning execution to owning result.
Great E4: I wrote perfect code and shipped perfect projects that are pixel-perfect, performant, bug-free, scalable, extensible, etc. Unfortunately, our PM pointed us in the wrong direction. All the experimentations are neutral or negative. My work didn't move the needle.
Bare minimum E5: I promised I could move this metric up by 5% in 3 months. By the end of the 3rd month, I delivered that 5%. (So many things went wrong in the process but I brought them back on track. PM picked the wrong idea and I pushed back to do the right thing. Another team promised to build the dependency we needed but failed to deliver so I hacked a temporary solution. Some experiments didn't deliver the expected outcome but I planned more experiments than merely 5% so the redundancy saved me.)
As you can see, E5 requires a lot of soft skills while you scale your hard skills. The problem is you won't have the opportunities to practice those skills all lined up in front of you. Sometimes there's just no such opportunity near you. Without trial and error, you won't be learning that skill. This unpredictability is actually the most difficult (and sometimes most frustrating) part. But that's life, full of random events.