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24 hr is enough if the coat is thin enough.
I don't think that’s the case. I tested the drying time of different oils on a sheet of plastic in optimal conditions (summer, sunlight, next to an open window) and it still took 2-3 days for the first ones to dry (being tung oil and perilla oil, I think).
I don’t see how you could accomplish that on wood, unless you’re using drying agents, of course.
Pure tung. I do this all the time. On wood. Maybe you're not putting a thin enough coat. Do you get a shine (without buffing)? Or do you get a matte finish?
The cloth is just damp with it, just enough to leave a sheen on the wood. Now I do put the cloth in a closed container and reuse it several times without needing to put fresh oil on it. So it's possible after the first coat its got a little bit of a start at polymerizing. But it remains damp, it doen't get hard or sticky, so if it starts polymerizing, its not obvious.
I'm doing this in my basement. No special curing conditions, no open window, no sunlight.
Also, maybe wood vs plastic makes a difference.
After thinking some, I should probably emphasize that I'm not claiming you can't get a good result with a less extremely thin coat...perhaps the 2-3 days you state is a way to do that. Others do it by sanding between coats, a lot of buffing, or thinning with terps.
I've gone toward doing it thinner over the years, but I have some good results from before I was as particular about thinness as I am now, but that have may have been because I happened not to get to it every 24 hours. I also have had problems from what was "too thick" to my mind, but possibly "not enough time between coats" is another valid take.
I do think though, that there is a point where no amount of time will give you a good cure. If you get a weird spot in the wood that wants to drink up the oil, and you let it, that soaked in oil never properly cures and can remain a problem.