We just did this trek a week ago when we stayed at Old Key West. It's a little closer than DD resorts but pretty close. It's a 10 minute ride to FW from DD and with any luck, not much more than 20 minutes to get to Pioneer Hall (that includes a wait for a bus). Once there, you check in and wait to have a family picture taken but that process seems to go pretty well. I would agree an hour is a good guess-timate for time.