I believe it's 3 hours prior to your flight as a rule of thumb. (For our 7:30pm flight our DME was scheduled at 4:30pm)
We stored our luggage with Bell Services in the morning then went to
MK for the day. We just made sure to be back at the resort by about 4:10pm to retrieve our luggage and get on the bus. I'm thinking you would have to catch the DME at your own resort...even if you could go from another resort, would you want to drag your luggage around? (Oh, unless you get to check it at the resort...we flew SWA and couldn't do that!)