This is the 6281st most frequent Swedish word.
lang
"Lang" in Swedish means "long."
Here, 'lang' is an adjective modifying 'väntan' (waiting) to describe its duration as lengthy or extending in time.
Jag känner en lang väntan inför resan.
I feel a long waiting ahead of the trip.
In this sentence, 'lang' is an adjective describing 'historia' (story), indicating its great length or extent in content or narrative.
Han har en lang historia om vad som hände.
He has a long story about what happened.
Here, 'lang' is used as an adjective for 'vägen' (the road), signifying its physical extent or distance.