I go for short sessions, cuz I have some health issues and stamina isn't my strong suit. My average session is 3-4 hours, from about 7pm-11pm, give or take. My goal for March was 3x/week, which I came very close to achieving. Figure 15-20 hands an hour, dealers vary wildly in their speed. So my # of hands, by online standards, is absurdly low. (Even by my own standards, where I only 4-table FR NL100.) Compared to Zoom, it's prob a joke. Variance will be a significant factor, absolutely no way around it.
Where I live there are about 6 casinos within driving distance (40 minutes), but NL 1/2 (and some FL 3/6, plus Omaha 1/2) are the only games spread. From what I've read, in USA you can find 1/2 and 2/5 in lots of places, with places like Vegas and LA going sky-high. There is a significant increase in # of regs at 2/5, so while there are still some soft spots, it's not the all you can eat buffet that 1/2 is. Unless the "regs" at 1/2 come from the online world, they don't have the discipline or maths that we do. Most regs are probably only marginal winners or worse. There are a couple who might make a living at 1/2 but not many. The only real winner is the house.
Any winning online grinder, from NL25 and up, can crush live 1/2, though as I mentioned, variance is rough when you only get involved in 4-5 hands an hour. I know your advice from the HH forum, you would ace it ainec. There are a couple of crucial adjustments you have to make. I can expand on any point in more detail if you want, but a quick and dirty summary of life at 1/2: pfr are between 6-10x; 3bets are very rare, but overcalls and limp/calls abound so multiway pots are the norm; ranging people is difficult because they will call a 10x with A6o; people will pay you off very light so spots where online you figure, "What worse could call me?", live players find a way. Also at my local, the Omaha is uncapped (I think), so it's really helpful to know who's sitting in at HE for $200 while they're waiting for a seat at Omaha for $5K, those players can't be scared at all.
If you can be patient and maintain a range advantage over these clowns, you're all set. One session, I left after about doubling my BI from 300 to 550. One V I stacked with AK vs a worse ace (I assume, he didn't show), said as I was leaving, "You only played 3 hands all night," and I couldn't help myself, I fired back, "Yeah, and I got paid on 2 of them."
I think I play a general TAG game, sometimes almost w cards face-up vs a thinking player, and I still get paid off. (I feel like a nit compared to my online game, but that's probably more about self-perception, a function of seeing 15 hands/hour vs 200. But also it's very rare to be in the HJ and no one has entered before you, so there's less rfi chances, which means I do play a bit less after all.)
I actually take notes on my phone so I'm building my own personal database, not on V's but so that I can see my own leaks. Prob get about 10-12 hands per session, literally any hand I vpip I note and plug into a spreadsheet the next day. See how I'm doing with SC, PP, position, etc. It will take a few months to get enough data but it's a start. And of the 40-50 players playing 1/2 at any given moment, and I've got 43 hours logged since mid-Feb when I started keeping track, I have seen only 1 other guy take HHs, and I've never seen him since. So any amount of study you put in off the felt is more than your opposition.
But when I said crush, I do mean crush. 5/5 might be a different beast, unless it is the lowest spread in your area. Then you'll get the same bad players I get, just with more money on the line.