In total the straight is around 2,6 Km long, depends on the points of metering. The first part that looks flat in this picture (I think around 700-800 meters or so) is slightly uphill in reality. Then begins the part where it goes stronger uphill (another 800-900 meters), you see this in the picture. Highest point is the Bilstein Bridge, there you have -no more to see in the pic- perhaps 300-400 meters flat (making a bend to the left) and then the last part of the straight (which is no straight) goes downhill for about 400-500 meters. Can't say that more exactly.
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