I have my longarm on a 10' frame with 36" on each end and 48" between the belly bar and the wall..the other side is facing my sewing area. I have plenty of room to work on either side of Miss Lizzie. I personally wanted a 10 foot frame to do large quilts..for some reason I seem to be making quilts larger and larger..oh well..keeping the fabric shops in business.
Here is a little tip...I use a car mechanics rolling stool, craftsmen..when I load the batting and backing on the bars it really helps to be able to see things better. I am not bending over..but at eye level.