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Goodness, I hope you don't have to remove it.
Curing time depends on the type and mix of concrete.
It will be stable within 72 hours no matter what.
Keeping it cool by hosing will stop it cracking.
I doubt a crack would be of any consequence.
I couldn't get into my ground more than about 700mm simply because it is chocolate rock/cracking clay on top of granite monolith and very hard; my pier hasn't moved as far as I can tell and it certainly isn't loose!
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