Don’t repeat the dictation, but DO use sensible phrase lengths. I use natural phrase cues when possible, but if necessary to make it an amount they can remember I shorten that a little (some of those passages have pretty long phrases!) So I often pause at a comma or a period if possible, if not at a logical place in the line. This helps the student, AND me, as I am often doing something else while waiting for the child to tell me he is ready to go on.