also how much space is needed for 30,000 people? I need to build an orbiter that will feed and make sure 30,000 people survive on Jupiter.
They probably won't all eat at the same time, since you'll have people working in shifts.
Reception venues recommend 10 to 15 square feet per person. So around 27,870 m2 to seat them all at once.
If you have three shifts then you can divide that by three: 10,000 m2
You can break those shifts up into seating times, allowing 45-60 minutes for each meal to sit, be served, eat and clean up afterwards. This would give you around 24 seating times total. But each shift needs three meals, so that's 8 seating times per shift. Space needed: 1250 m2