Is the plural "kvällarna" required here even with "brukar"? In English, the "usually" implies a habitual routine so "in the evening" is effectively understood as equivalent to "in the evenings": does Swedish work similarly or differently?
Thanks for the clarification. I have been wondering about this in other sentences. I always get them wrong because it is not natural to use the plural when referring to the date/time of a recurring action.
Now the question is, are there exceptions?