Hi, As a native British English speaker I have to say I have never heard this expression before, and I wonder if the person you heard it from made a mistake. Seonaid
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Grammar GeekIt's common in the US to say "It's ten of..." in addition to "It's ten to..."Pronunciations that are common: ten-da-five (ten to five); ten-a-five (ten of five).
If it's 16:50, then it's ten of five.