The best comparison I'm aware of would be Wave Breaker at SeaWorld San Antonio. It similarly has two somewhat low-speed launches and is 2,600′. It's a short ride but has a lot of elements, the type of ride that is enjoyable but not something for which I'd wait long. Stating the obvious here, but ride time for SDD will depend on the speed of the launch and whether the trains are stopped (and for how long) before a launch.
Doing the best I could estimating height from other objects in the aerial views, I estimated the largest drop at 49 feet (15 meters) which would accelerate the train 38mph from whatever speed it's going at the top of that hill (actually slightly less, because of friction, wind resistance, and that every car in the train does not reach the lowest or highest part of the track simultaneously). So figure a ~50mph top speed and probably closer to 30mph for an average. A half mile per minute over a half mile of track is a minute of ride elements. Then again, I don't really trust my own estimates here.