So, I didn't actually apply to HMSOM when I first applied during the 2018-2019 cycle. I was stupid about a lot of things - didn't diversity my school choices enough and applied fairly late in the cycle (was complete in early october at most schools). I had one interview but that was in march of 2019 and I ended up on the waitlist and obviously did not move off that waitlist because here I am, lol.
I think my situation is a little strange because I've been out of college since 2014, I have a master's degree in something totally unrelated to medicine, and worked in education for a while. When I first applied I had some significant experience "interning" (really shadowing) under a pediatrician but otherwise my other experiences were not related to medicine at all. Since my first unsuccessful application cycle, I added some other medically related ECs - emergency room volunteering and switching careers from education to clinical research. I took some prerequisites I never completed during undergrad - biochem and biostats - this past summer. I also made sure I poured my blood sweat and tears into my PS and secondaries, and submitted a bit earlier than last time (I think I was complete in early-mid september this time around). One of my strengths is writing/the humanities but this time around I actually paid a friend who is a writing coach to help me with my essays, and aggressively edited my secondaries/got second looks from my partner before submitting them.
In terms of hours, here's what I listed but tbh they are approximate and I think incorporate anticipated future hours as well: community volunteering during covid, 250; research job, 3000; ED volunteering, 500; physician shadowing at the same practice every week, 250; previous education job, 6000. Obviously I have quite a few from my full-time research job, but the other activities, like ED volunteering and volunteering in my community were probably just relevant/notable due to consistency. I had been volunteering at the same ED once or twice a week since 2018 until COVID hit, for example. ANYWAY, apologies for the long post. It's such a crapshoot of a process and plenty of interview invites are sent out in January so I'm hoping you get a few, but even if not, I get that it's smart to start thinking about reapplying early.