This is the 327th most frequent Finnish word.
pitkä
"Pitkä" means "long" in English.
The word 'pitkä' is used here as an adjective to describe height, synonymous with 'tall'.
Hän on pitkä mies.
He is a tall man.
In this sentence, 'pitkä' describes time duration, indicating it felt extended.
Meillä oli pitkä päivä töissä.
We had a long day at work.
Here, 'pitkä' is used to describe length in terms of content volume of the letter.