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часами напролётstresses
gen. by the hour together (Пример: "Pearl mumbled something into his ear that sounded, indeed, like human language, but was only such gibberish as children may be heard amusing themselves with by the hour together" – The Scarlet Letter by Nathaniel Hawthorne Dorian Roman); for hours on end (Maria Klavdieva)
часами напролёт: 2 phrases in 1 subject
General2