This is the 138th most frequent Hungarian word.
pénteken
"On Friday"
Here, 'péntekenként' is a variation of 'pénteken' indicating repeated occurrences on Fridays, used in a habitual context.
Az áruház péntekenként hosszabb ideig tart nyitva.
The store stays open longer on Fridays.
In this example, 'múlt pénteken' means 'last Friday,' indicating a specific Friday in the past.
Múlt pénteken voltam múzeumban.
I went to the museum last Friday.
In this sentence, 'pénteken' specifies the day of the week when an action (meeting friends) is happening.