@ VulpesRex:
Yes, there will be more public traffic on a Sunday. Especially @ the concerning EF weekend, because in Sachsen-Anhalt, school starts back on the 25th. So in my experience, parents travelling with children will preferably choose the 20th or 21st to come back home.
In generell - and perhaps still on the 21st - you will be much faster @ Sunday, cause on Sundays and public holidays, trucks are not allowed to drive between 12am and 10pm. And on German motorways, it is mostly trucks that slow you down.