This is the 3380th most frequent Dutch word.
langdurig
"Langdurig" means "long-lasting" or "extended" in English.
The word 'langdurig' in this sentence is used as an adjective to describe the illness as being of a prolonged duration.
Hij had een langdurige ziekte, waardoor hij niet kon werken.
He had a long-term illness, which prevented him from working.
Here, 'langdurig' modifies 'inzet' (commitment), emphasizing the need for continuous and long-term effort.
Het project vereist langdurige inzet van alle teamleden.
The project requires prolonged commitment from all team members.
In this context, 'langdurige' describes the negotiations as extended over a considerable period.