Past CLM brides who booked at Hilton LI

Did any of you get the shuttle service? They are telling me it takes 30 minutes from the hotel to CLM...but I thought it was 15 minutes?! I'm trying to give my guests a schedule of times that the shuttle will be departing from the hotel, but I cant if I dont know how long it takes to and from

If you had the shuttle, what was the schedule of times or how long did it take for it to make a ROUND TRIP???