In general, the air carrier must pay your refund within seven days. However, due to the current situation, it is recommended that you arm yourself with patience. You can file a complaint to the Danish Civil Aviation and Railway Authority if the air carrier does not respond to your inquiry within six weeks.
There are currently many air carriers receiving many inquiries and many of these air carriers have been forced to lay-off their staff. Therefore, it may take longer than under normal circumstances for the air carrier to respond to your inquiry.