An hour or an hour and fifteen minutes
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At every hour exactly, for example 'the train will leave at 1pm or 2pm and so on - on the hour.
"5p per hour" is not an acronym so please amend your question.
Per means "for each", so maybe you walk at 4 miles per 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