Is there a reason to end this mission?
Solution 1:
Nope, feel free to farm to your hearts content.
Solution 2:
You can farm on the map as long as you want until whenever you want to retreat. I used this opportunity to:
- Promote all of my squad members
- Farm resources, corpses, and also equipment drops (like weapon mods)
- Great so you can sell them later on in the Black Market for extra supplies