How long does it take to drive (by car) from Brussels, Belgium to Berlin (post code 10115, the Mitte area)?

Are there any tolls along the autobahn? And what are the legal speed limits (minimum and maximum)?
Update: I was asking about TOLL roads ("payage" in France, where you have to pay to use a portion of the highway). Are there any on the autobahn between Brussels & Berlin?
(Trolls can be found for free...apparently...)
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