Reply to "minutes?"

quote:
I don't know whether it's said more in some regions than in others. In my mind, it seems that expressions like 'twenty of four' used to be said more than they are now.

I have seen many textbooks (both old and new ones), but in none of them I have ever seen "of" used for telling time!!! Could you guess why?! May it be regarded as non-standard?!
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