Fraværet registreres i den vanlige arbeidstiden.

during

Breakdown of Fraværet registreres i den vanlige arbeidstiden.

• registrere: to register (information)
• fraværet: the absence
• den vanlige arbeidstiden: the usual working hours

Questions & Answers about Fraværet registreres i den vanlige arbeidstiden.

Why is fraværet written as one word with -et at the end?

Because Norwegian usually puts the definite article at the end of the noun.

• fravær = absence
• fraværet = the absence

The base noun is et fravær, so it is a neuter noun. In the definite singular, neuter nouns normally take -et:

• et fravær → fraværet

This is very common in Norwegian and is one of the first big differences from English.

Why does registreres end in -s?

The -s shows the passive voice.

So registreres means something like:

• is registered
• gets registered

The active version would be:

• Noen registrerer fraværet = someone registers the absence

The sentence you have is passive because the important thing is the process or rule, not who does it.

Could I also say Fraværet blir registrert instead of Fraværet registreres?

Yes. Both are passive, and both are correct.

• Fraværet registreres = s-passive
• Fraværet blir registrert = bli-passive

In administrative or formal language, the -s passive is very common and often sounds neat and official.
So in rules, policies, and instructions, registreres is very natural.