True, he can't. But he can do it quite a few times. He used it 3 times against Kyuubi Naruto, and the last one was after he'd already used a massive amount of Chakra for Triple Rashomon
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(Sorry about the picture quality)
And that was of course when he was far from 100%. So at full power with no sickness I'd say he could use anywhere between 5 to 15 times, give or take. There's not a very proper gauge for it.
Also, Orochimaru has a few speed feats of his own, in order to weave through puppets and Iron Sand.
At the Tenchii Bridge,
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Orochimaru started somewhere in the forest,
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And appeared behind Kabuto in an instant.
There's also another off the top of my head.
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When he Shunshin'd to stop Sasuke.
Not to mention Leech All Creation or possibly Hidden Mole Jutsu for further defense and possibly adding an element of surprise.
Also, Manda will be a big help in this as well. The weapons of the normal puppets won't be harming Manda in any way. But it's possible the Iron Sand could, but idk as Manda is a *very* durable snake. Remaining in one piece after withstanding an unknown portion of C0. Of course it killed him, but the fact he wasn't evaporated is a testament to his durability.
I don't want to debate, those are just thoughts of mine.