This is the 453rd most frequent Icelandic word.
lengi
"Lengi" means "for a long time" in English.
Here, 'lengi' is used to ask about the duration of an action (staying).
Viltu ekki vera lengi?
Don't you want to stay long?
In this example, 'lengi' emphasizes a period of time as being extended or excessive.
Þarf þetta að taka svona lengi?
Does this have to take so long?
In this sentence, 'lengi' is used to express the duration of time that has passed since an event (not seeing someone in this case).