This is the 918th most frequent Icelandic word.
löngum
"löngum" means "for a long time" or "in the past" in English.
In this sentence, 'löngum' is an adverb meaning 'for a long time.' It indicates a sustained period of interest.
Hún hefur löngum verið áhugasöm um listir.
She has long been interested in arts.
Here, 'löngum' functions as an adverb describing the duration of their stay.
Þeir dvöldu löngum á bókasafninu að lesa.
They stayed for a long time at the library reading.
In this example, 'löngum' is used to signify that the dream persisted over an extended time.