They must clarify. 90% of the time they mean "in three days" but sometimes not.
It's better to say "this coming Friday" and "the Friday after this one", for the 3 and 10 day option. It's clearer.
agreed! i feel like the concensus, at least anecdotally where i live, is that it would mean in 10 days but to me i think it means 3 days.
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