I don't use a walking for on the lengths you have described. the point of walking foot is from an accumulated length of run where the top and the bottom will not quite move along as the sandwiched fabrics teeth walk the length.
vote no on the size of run you are describing.. I do use a walking for for binding. for long stitching up and down quilt tops 42 inch, sometimes 36 inch..
yes? no? on lenghts.. you will decide for yourself.. this is a tool I have LOVED for many years. but do not always use.
Best of luck,
Ell