It took some time to regenerate Madara's limbs, the time he was talking with Wuubito, he was all time just a floating body, in the end. He as you said, instantly regenerated them. I doubt the same thing would happen to Kaguya even if she didn't get struck by varied rasen shurikens.
Since after Madara becoming a juubi jin, or even anyone who had a Juubi in him, instead of being buffed, he loses a large amount of reflexes and becomes an idiot. It's like trade your brain for some power.
I also noticed something. reading that chapter where Madara with Wuubito had a chat. Just like Obito's hands, Madara managed to pierce him as well. They're like gum or something.
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I said this somewhere. "Sage's chakra is like the ultimate mental illness cure while Hashirama's cells are like the ultimate physical illness cure."
That was half a body though. When he lost an arm and had a chunk out of his side he healed quicker. The stolen SM must've run out. Although half a body would take longer. I still think Kaguya was nerfed, at least compared to her hype.
