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An hour or an hour and fifteen minutes
At every hour exactly, for example 'the train will leave at 1pm or 2pm and so on - on the hour.
If you mean 2/3 of an hour then there are 40 minutes
If you mean 2/3 of an hour then there are 40 minutes
I think you mean "What is 3rd of an hour in minutes?" 1 hour = 60 minutes 1/3 hour = 60/3 = 20 minutes