Well depending what time you are going, if it's after the Candy Cane shuttle starts, you could take that to the park entrance and then walk through DTD which would add another 10 minutes or so after the shuttle. If it's before hours, I would set aside 20-25 minutes to make it to the DLH, but we have kids. I would probably be inclined to call a cab, although one of my favorite things to do is walk through DTD before opening. Just gives me a great feeling!!! Have fun!
Andrea