Years ago it was common to mow the field entirely, round and round. Then rake and bale the same way , if using a square baler. AC Roto-Baler, we raked windrows differently, always the length of the field, because the windrows need to be doubled up to make a decent roto bale. When I started chopping haylage in the 70s, 3 times around with the 9 foot Haybine, then split the field into long sections, usually changing wagons at the near end of the field. Chopper head picks up fine in either direction. Later, with 14 foot JD 800 swather, 3 rounds, then back and forth. NI 9 foot 5209 Discbine, 3 rounds, then make splits about every 7 acres on a square 40, and run the long way. Some fields were a half mile long, so 14 acres on a land. Same as moldboard plowing, 10 rounds was a comfortable split, no matter the size of the machine. 3 swaths gives plenty of room to turn in my fields. 6-8 rounds in a small patch might be the majority of the field. End rows are always very time consuming, compared to cutting the rest of the field.