This is the 15140th most frequent German word.
stundenlange
"Stundenlange" means "for hours" or "lasting hours."
"Stundenlange" is used as an adjective to describe "Gespräche" (conversations), indicating the lengthy duration of the conversations.
Ich hatte stundenlange Gespräche mit meinem Freund.
I had hours-long conversations with my friend.
"Stundenlangen" modifies "Arbeit" (work), specifying that the work lasted several hours.
Nach der stundenlangen Arbeit fühlte sie sich sehr müde.
After the hours-long work, she felt very tired.
Here, "Stundenlange" describes "Warten" (waiting), emphasizing the prolonged period of time spent waiting.