We rent out our LA and customers have done a queen size with all over meandering and simple designs in 4-6 hours. We do not use zippers but do have the gripper rods so loading is very fast. We do make sure that we are always on hand just in case something does not go to plan (some quilts have more personality than others! lol)
Good Luck you will have a fab time and I am sure that having a quilt that you have completely finished yourself will only add to the experience