This is the 281st most frequent Italian word.
lunga
"Lunga" means "long" in English.
The adjective 'lunga' is used here to describe the noun 'giornata', indicating an extended duration of time.
Lei ha una lunga giornata di lavoro oggi.
She has a long workday today.
In this case, 'lunga' qualifies the noun 'strada', referring to physical distance or length.
La strada per arrivare al castello è molto lunga.
The road to reach the castle is very long.
Here, 'lunga' is an adjective portraying the extent or duration of the story ('storia').