The duration of soreness depends on a lot of things, like the muscle group, whether you cool down post-lifting, nutrition, etc. But, in general, the soreness from any given session is likely to dissipate after 2-3 days. ("Second-day sores" are notoriously the worst, esp. on legs.)
After even just a few sessions on any given body part, you'll start to notice that you don't get as sore, the soreness doesn't last as long, or both. Even here, though, there's variation. I don't typically get sore after chest/shoulder workouts anymore, unless I've recently switched around exercises, but I do still get sore after legs. (I've been lifting off and on for 10 years, 5 months "on" most recently.)
HTH
Kim
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