SD to Sabana de la Mar by the new highway: how long?

We wanna go to Paraiso Ca?o Hondo in Sabana de la Mar and were wondering how long it takes to drive there on the new highway. Do we need a 4x4 or will a "regular" car be able to go there and back with no probs or do you think it's better to go by public bus (we take them on Parque Enriquillo, right?)?

Any other tips are welcome.

TIA

PS: Moderator: move this thread to the forum that you think fits best, if I have failed to post it right the first time.

Thanks. I thought there was an exit that we could use.

It is my understanding that the new highway is close to Las Am?ricas airport but I'm not sure.