This is the 506th most frequent Norwegian word.
cirka
Approximately.
In this sentence, 'cirka' is used to indicate an approximate time for the arrival.
Jeg vil ankomme cirka klokken åtte.
I will arrive at around eight o'clock.
Here, 'cirka' specifies an estimated duration for the drive.
Det tar cirka tre timer å kjøre dit.
It takes approximately three hours to drive there.
In this instance, 'cirka' is used to denote an estimated weight of the package.