This is the 300th most frequent Polish word.
całego
"Całego" means "whole" or "entire" (masculine singular genitive or accusative form).
Here, 'całego,' in an inflected form 'całą,' is used to emphasize completeness of the object, 'książka' (book).
Przeczytałem całą książkę.
I read the entire book.
In this sentence, 'całego,' here as 'całą,' is referring to the full extent of 'okolica' (area).
Podczas wycieczki zwiedziłem całą okolicę.
During the trip, I explored the entire area.
This sentence uses 'całego' to describe the entirety of 'film' (movie), emphasizing that it wasn't completed.