This is the 336th most frequent Croatian word.
dugo
"Long" or "for a long time."
Here, 'dugo' describes a long duration of time.
Čekala sam dugo na autobus.
I waited a long time for the bus.
'Dugo' in this sentence characterizes spatial length, referring to the perceived length of the road.
Na tom putovanju, cesta je izgledala jako dugo.
On that journey, the road seemed very long.
Here, 'dugo' is used to describe an extended period of time during which something did not occur.