If you remove the cowl, disconnect the coolant lines to the turbo and remove the stock heat shield the DP install is very easy. The time needed all depends on the bolt at 11 o'clock where it attaches to the turbo and if it comes out, strips or breaks...
If I had to do it again right now I could probably swap out the DP in 45 minutes, but I have removed all those parts around 3 times now and am very familiar with it. I'd say 2 hours at a local shop is a good estimate, if all goes well...