Could Itachi train someone in Tsukuyomi, and would this change if he had access to EMS?

Hi

I've been thinking about the potential of Itachi's Tsukuyomi and wanted to throw a question out there for discussion. We know that Tsukuyomi is an incredibly powerful Genjutsu, and the way it distorts time inside the illusion (what feels like days, years, or even decades in just a moment) got me wondering:

Would Itachi hypothetically be able to train someone in Tsukuyomi for decades? Since time inside the Genjutsu is subjective, could he theoretically train someone in taijutsu, kenjutsu, ninjutsu, fuinjutsu, and genjutsu in a dream-like world, like how Naruto uses Shadow Clones to learn and practice techniques? The person would be in an illusion, so their body wouldn’t physically develop, but their mental and tactical skills could potentially grow over decades of training.

Additionally, I wanted to raise another question: what if Itachi had access to the Eternal Mangekyo Sharingan (in this scenario, after receiving his father’s eyes)? Would the power boost and reduced strain from the Eternal Mangekyo Sharingan allow him to maintain this long-term Tsukuyomi training session for much longer periods? Maybe it would make the process more sustainable for Itachi and enable him to manipulate the illusion without risking his own health or stamina.

Looking forward to hearing your thoughts!