"Vad brukar ni göra på kvällarna?"

Translation: What do you usually do in the evenings?

[Ward.Joshua]

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?

[davost]

Swedish works similarly. You can say Vad brukar ni göra på kvällen and it would mean the same thing.

[Tasha257618]

Why is "what do you usually do in the evening" marked as wrong then?

[Nevae604]

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?

[Nierion]

Shouldn't "What do you normally do in the evenings?" also be accepted?