A 7 hour cut in Aspire is likely to be a 3D finishing operation. The toolpath area is determined by a boundary vector. By drawing multiple boundary vectors across the area, you can create smaller areas that can be run separately.
However, if you're carving wood, it's possible that it could move overnight from stresses in the previous cut area, and you may see the border between the multiple sections.
You also need to rezero the tool the next day to exactly the same place, or you'll again see a border.