I havent stayed there but I did stay at the Holiday Inn across the street.( no longer open) and the walk was about 7 - 10 minutes. All of the hotels on Hotel Plaza Blvd should be less than 30 walk to DTD , marketplace side.
I stayed at the Royal Plaza one hotel further away from DTD than the Holiday Inn...and indeed the walk was an easy 10 minutes for 2 adults. If I had children with us it may have taken a little longer or felt longer .